diff --git a/testing/web-platform/meta/beacon/beacon-redirect.window.js.ini b/testing/web-platform/meta/beacon/beacon-redirect.window.js.ini
index 953e225213fd..8e7a67ee0e7f 100644
--- a/testing/web-platform/meta/beacon/beacon-redirect.window.js.ini
+++ b/testing/web-platform/meta/beacon/beacon-redirect.window.js.ini
@@ -1,3 +1 @@
 [beacon-redirect.window.html]
-  disabled:
-    if (os == 'win' and processor == 'aarch64'): https://bugzilla.mozilla.org/show_bug.cgi?id=1531534
\ No newline at end of file
diff --git a/testing/web-platform/meta/feature-policy/reporting/encrypted-media-report-only.https.html.ini b/testing/web-platform/meta/feature-policy/reporting/encrypted-media-report-only.https.html.ini
index de49b4b4e53d..745609f65412 100644
--- a/testing/web-platform/meta/feature-policy/reporting/encrypted-media-report-only.https.html.ini
+++ b/testing/web-platform/meta/feature-policy/reporting/encrypted-media-report-only.https.html.ini
@@ -1,11 +1,11 @@
 [encrypted-media-report-only.https.html]
-  disabled:
-    if (os == 'win' and processor == 'aarch64'): https://bugzilla.mozilla.org/show_bug.cgi?id=1536909
   expected:
     if (os == "android"): OK
+    if (os == "win" and processor == "aarch64"): OK
     TIMEOUT
   [Encrypted Media report only mode]
     expected:
       if (os == "android"): FAIL
+      if (os == "win" and processor == "aarch64"): FAIL
       TIMEOUT
 
diff --git a/testing/web-platform/meta/fetch/sec-metadata/redirect/cross-site-redirect.tentative.https.sub.html.ini b/testing/web-platform/meta/fetch/sec-metadata/redirect/cross-site-redirect.tentative.https.sub.html.ini
index ff5d3abc74b2..fef54fc0b140 100644
--- a/testing/web-platform/meta/fetch/sec-metadata/redirect/cross-site-redirect.tentative.https.sub.html.ini
+++ b/testing/web-platform/meta/fetch/sec-metadata/redirect/cross-site-redirect.tentative.https.sub.html.ini
@@ -1,4 +1,6 @@
 [cross-site-redirect.tentative.https.sub.html]
+  expected:
+    if (processor == 'aarch64' and os == 'win'): CRASH # aarch64 due to bug 1540864
   [Cross-Site -> Cross-Site redirect]
     expected: FAIL
 
diff --git a/testing/web-platform/meta/fetch/sec-metadata/redirect/multiple-redirect-cross-site.tentative.https.sub.html.ini b/testing/web-platform/meta/fetch/sec-metadata/redirect/multiple-redirect-cross-site.tentative.https.sub.html.ini
index ea5a2ec1a126..5059673f1767 100644
--- a/testing/web-platform/meta/fetch/sec-metadata/redirect/multiple-redirect-cross-site.tentative.https.sub.html.ini
+++ b/testing/web-platform/meta/fetch/sec-metadata/redirect/multiple-redirect-cross-site.tentative.https.sub.html.ini
@@ -1,4 +1,6 @@
 [multiple-redirect-cross-site.tentative.https.sub.html]
+  expected:
+    if (processor == 'aarch64' and os == 'win'): CRASH # aarch64 due to 1540864
   [Same-Origin -> Cross-Site -> Same-Origin redirect]
     expected: FAIL
 
diff --git a/testing/web-platform/meta/fetch/sec-metadata/redirect/multiple-redirect-same-site.tentative.https.sub.html.ini b/testing/web-platform/meta/fetch/sec-metadata/redirect/multiple-redirect-same-site.tentative.https.sub.html.ini
index cb4a0801f78b..9ea6416461c2 100644
--- a/testing/web-platform/meta/fetch/sec-metadata/redirect/multiple-redirect-same-site.tentative.https.sub.html.ini
+++ b/testing/web-platform/meta/fetch/sec-metadata/redirect/multiple-redirect-same-site.tentative.https.sub.html.ini
@@ -1,4 +1,6 @@
 [multiple-redirect-same-site.tentative.https.sub.html]
+  expected:
+    if (processor == 'aarch64' and os == 'win'): CRASH # aarch64 due to 1540864
   [Same-Origin -> Same-Site -> Same-Origin redirect]
     expected: FAIL
 
diff --git a/testing/web-platform/meta/fetch/sec-metadata/redirect/same-origin-redirect.tentative.https.sub.html.ini b/testing/web-platform/meta/fetch/sec-metadata/redirect/same-origin-redirect.tentative.https.sub.html.ini
index 0ec11a20c116..c1296a998507 100644
--- a/testing/web-platform/meta/fetch/sec-metadata/redirect/same-origin-redirect.tentative.https.sub.html.ini
+++ b/testing/web-platform/meta/fetch/sec-metadata/redirect/same-origin-redirect.tentative.https.sub.html.ini
@@ -1,4 +1,6 @@
 [same-origin-redirect.tentative.https.sub.html]
+  expected:
+    if (processor == 'aarch64' and os == 'win'): CRASH # aarch64 due to 1540864
   [Same-Origin -> Cross-Site redirect]
     expected: FAIL
 
diff --git a/testing/web-platform/meta/fetch/sec-metadata/redirect/same-site-redirect.tentative.https.sub.html.ini b/testing/web-platform/meta/fetch/sec-metadata/redirect/same-site-redirect.tentative.https.sub.html.ini
index 72a5cbe072e8..126e2c29cf27 100644
--- a/testing/web-platform/meta/fetch/sec-metadata/redirect/same-site-redirect.tentative.https.sub.html.ini
+++ b/testing/web-platform/meta/fetch/sec-metadata/redirect/same-site-redirect.tentative.https.sub.html.ini
@@ -1,4 +1,6 @@
 [same-site-redirect.tentative.https.sub.html]
+  expected:
+    if (processor == 'aarch64' and os == 'win'): CRASH # aarch64 due to 1540864
   [Same-Site -> Same-Origin redirect]
     expected: FAIL
 
diff --git a/testing/web-platform/meta/html/infrastructure/urls/resolving-urls/query-encoding/navigation.sub.html.ini b/testing/web-platform/meta/html/infrastructure/urls/resolving-urls/query-encoding/navigation.sub.html.ini
index 44f691fb7642..54a2ff3f1f39 100644
--- a/testing/web-platform/meta/html/infrastructure/urls/resolving-urls/query-encoding/navigation.sub.html.ini
+++ b/testing/web-platform/meta/html/infrastructure/urls/resolving-urls/query-encoding/navigation.sub.html.ini
@@ -1,5 +1,6 @@
 [navigation.sub.html?encoding=x-cp1251]
   expected:
+    if (os == "win" and processor == "aarch64"): OK
     if not debug and e10s and (os == "linux") and (processor == "x86"): TIMEOUT
     if not debug and not asan and e10s and (os == "linux") and (processor == "x86_64"): TIMEOUT
     if not debug and (os == "win"): TIMEOUT
@@ -13,6 +14,7 @@
 
 [navigation.sub.html?encoding=utf8]
   expected:
+    if (os == "win" and processor == "aarch64"): OK
     if not debug and e10s and (os == "linux") and (processor == "x86"): TIMEOUT
     if not debug and not asan and e10s and (os == "linux") and (processor == "x86_64"): TIMEOUT
     if not debug and (os == "win"): TIMEOUT
@@ -26,6 +28,7 @@
 
 [navigation.sub.html?encoding=windows-1252]
   expected:
+    if (os == "win" and processor == "aarch64"): OK
     if not debug and e10s and (os == "linux") and (processor == "x86"): TIMEOUT
     if not debug and not asan and e10s and (os == "linux") and (processor == "x86_64"): TIMEOUT
     if not debug and (os == "win"): TIMEOUT
diff --git a/testing/web-platform/meta/html/semantics/embedded-content/media-elements/track/track-element/track-cue-negative-timestamp-events.html.ini b/testing/web-platform/meta/html/semantics/embedded-content/media-elements/track/track-element/track-cue-negative-timestamp-events.html.ini
index 80e27118be44..cecca15b5b6f 100644
--- a/testing/web-platform/meta/html/semantics/embedded-content/media-elements/track/track-element/track-cue-negative-timestamp-events.html.ini
+++ b/testing/web-platform/meta/html/semantics/embedded-content/media-elements/track/track-element/track-cue-negative-timestamp-events.html.ini
@@ -1,3 +1,2 @@
 [track-cue-negative-timestamp-events.html]
-  disabled:
-    if (os == 'win' and processor == 'aarch64'): https://bugzilla.mozilla.org/show_bug.cgi?id=1538303
+
diff --git a/testing/web-platform/meta/html/semantics/embedded-content/media-elements/track/track-element/track-cues-pause-on-exit.html.ini b/testing/web-platform/meta/html/semantics/embedded-content/media-elements/track/track-element/track-cues-pause-on-exit.html.ini
index bc770f9a55d6..d0c0f82035ba 100644
--- a/testing/web-platform/meta/html/semantics/embedded-content/media-elements/track/track-element/track-cues-pause-on-exit.html.ini
+++ b/testing/web-platform/meta/html/semantics/embedded-content/media-elements/track/track-element/track-cues-pause-on-exit.html.ini
@@ -1,4 +1,2 @@
 [track-cues-pause-on-exit.html]
-  disabled:
-    if (os == 'win' and processor == 'aarch64'): https://bugzilla.mozilla.org/show_bug.cgi?id=1538303
 
diff --git a/testing/web-platform/meta/html/semantics/embedded-content/media-elements/track/track-element/track-cues-sorted-before-dispatch.html.ini b/testing/web-platform/meta/html/semantics/embedded-content/media-elements/track/track-element/track-cues-sorted-before-dispatch.html.ini
index 977134b6dfdb..3905e9a6d5b1 100644
--- a/testing/web-platform/meta/html/semantics/embedded-content/media-elements/track/track-element/track-cues-sorted-before-dispatch.html.ini
+++ b/testing/web-platform/meta/html/semantics/embedded-content/media-elements/track/track-element/track-cues-sorted-before-dispatch.html.ini
@@ -1,4 +1,2 @@
 [track-cues-sorted-before-dispatch.html]
-  disabled:
-    if (os == 'win' and processor == 'aarch64'): https://bugzilla.mozilla.org/show_bug.cgi?id=1538303
 
diff --git a/testing/web-platform/meta/html/semantics/embedded-content/media-elements/track/track-element/track-disabled-addcue.html.ini b/testing/web-platform/meta/html/semantics/embedded-content/media-elements/track/track-element/track-disabled-addcue.html.ini
index f4560126152b..ba23eaa3df8b 100644
--- a/testing/web-platform/meta/html/semantics/embedded-content/media-elements/track/track-element/track-disabled-addcue.html.ini
+++ b/testing/web-platform/meta/html/semantics/embedded-content/media-elements/track/track-element/track-disabled-addcue.html.ini
@@ -1,4 +1,2 @@
 [track-disabled-addcue.html]
-  disabled:
-    if (os == 'win' and processor == 'aarch64'): https://bugzilla.mozilla.org/show_bug.cgi?id=1538303
 
diff --git a/testing/web-platform/meta/html/semantics/embedded-content/media-elements/track/track-element/track-disabled.html.ini b/testing/web-platform/meta/html/semantics/embedded-content/media-elements/track/track-element/track-disabled.html.ini
index 79318653202e..002feaa36f3d 100644
--- a/testing/web-platform/meta/html/semantics/embedded-content/media-elements/track/track-element/track-disabled.html.ini
+++ b/testing/web-platform/meta/html/semantics/embedded-content/media-elements/track/track-element/track-disabled.html.ini
@@ -1,4 +1,2 @@
 [track-disabled.html]
-  disabled:
-    if (os == 'win' and processor == 'aarch64'): https://bugzilla.mozilla.org/show_bug.cgi?id=1538303
 
diff --git a/testing/web-platform/meta/html/semantics/embedded-content/the-img-element/img.complete.html.ini b/testing/web-platform/meta/html/semantics/embedded-content/the-img-element/img.complete.html.ini
index 4079d2e578ca..9a26474cd842 100644
--- a/testing/web-platform/meta/html/semantics/embedded-content/the-img-element/img.complete.html.ini
+++ b/testing/web-platform/meta/html/semantics/embedded-content/the-img-element/img.complete.html.ini
@@ -1,4 +1,6 @@
 [img.complete.html]
+  expected:
+    if (processor == 'aarch64' and os == 'win'): CRASH # aarch64 due to bug 1540865
   [IDL attribute complete returns true when image resource has been fetched but not run yet & image is not in broken state]
     expected: FAIL
 
diff --git a/testing/web-platform/meta/signed-exchange/reporting/sxg-reporting-navigation-mi_error.tentative.html.ini b/testing/web-platform/meta/signed-exchange/reporting/sxg-reporting-navigation-mi_error.tentative.html.ini
index de7458815182..fe9f1fd4a3a6 100644
--- a/testing/web-platform/meta/signed-exchange/reporting/sxg-reporting-navigation-mi_error.tentative.html.ini
+++ b/testing/web-platform/meta/signed-exchange/reporting/sxg-reporting-navigation-mi_error.tentative.html.ini
@@ -7,7 +7,7 @@
     if not debug and webrender and e10s and (os == "win") and (version == "10.0.17134") and (processor == "x86_64") and (bits == 64): TIMEOUT
     if not debug and webrender and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86_64") and (bits == 64): TIMEOUT
     if not debug and not webrender and e10s and (os == "mac") and (version == "OS X 10.10.5") and (processor == "x86_64") and (bits == 64): TIMEOUT
-    if (os == "win") and (processor == "aarch64"): TIMEOUT # 1538379
+    if (os == "win") and (processor == "aarch64"): OK # 1538379
   [SXG reporting test of sxg.mi_error for navigation.]
     expected:
       if debug and not webrender and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86") and (bits == 32): FAIL
@@ -27,5 +27,5 @@
       if not debug and webrender and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86_64") and (bits == 64): TIMEOUT
       if not debug and webrender and e10s and (os == "win") and (version == "10.0.17134") and (processor == "x86_64") and (bits == 64): TIMEOUT
       if not debug and not webrender and e10s and (os == "mac") and (version == "OS X 10.10.5") and (processor == "x86_64") and (bits == 64): TIMEOUT
-      if (os == "win") and (processor == "aarch64"): TIMEOUT # 1538379
+      if (os == "win") and (processor == "aarch64"): FAIL # 1538379
 
diff --git a/testing/web-platform/meta/signed-exchange/reporting/sxg-reporting-navigation-parse_error.tentative.html.ini b/testing/web-platform/meta/signed-exchange/reporting/sxg-reporting-navigation-parse_error.tentative.html.ini
index 35f23f4ec150..697776404b0a 100644
--- a/testing/web-platform/meta/signed-exchange/reporting/sxg-reporting-navigation-parse_error.tentative.html.ini
+++ b/testing/web-platform/meta/signed-exchange/reporting/sxg-reporting-navigation-parse_error.tentative.html.ini
@@ -7,7 +7,7 @@
     if not debug and webrender and e10s and (os == "win") and (version == "10.0.17134") and (processor == "x86_64") and (bits == 64): TIMEOUT
     if not debug and webrender and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86_64") and (bits == 64): TIMEOUT
     if not debug and not webrender and e10s and (os == "mac") and (version == "OS X 10.10.5") and (processor == "x86_64") and (bits == 64): TIMEOUT
-    if (os == "win") and (processor == "aarch64"): TIMEOUT # 1538379
+    if (os == "win") and (processor == "aarch64"): OK # disabled in 1538379, re-enabled to FAIL in 1539693
   [SXG reporting test of sxg.parse_error for navigation.]
     expected:
       if debug and not webrender and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86") and (bits == 32): FAIL
@@ -27,5 +27,5 @@
       if not debug and webrender and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86_64") and (bits == 64): TIMEOUT
       if not debug and webrender and e10s and (os == "win") and (version == "10.0.17134") and (processor == "x86_64") and (bits == 64): TIMEOUT
       if not debug and not webrender and e10s and (os == "mac") and (version == "OS X 10.10.5") and (processor == "x86_64") and (bits == 64): TIMEOUT
-      if (os == "win") and (processor == "aarch64"): TIMEOUT # 1538379
+      if (os == "win") and (processor == "aarch64"): FAIL # disabled in 1538379, re-enabled to FAIL in 1539693
 
diff --git a/testing/web-platform/meta/signed-exchange/reporting/sxg-reporting-prefetch-cert_fetch_error-downgraded.tentative.html.ini b/testing/web-platform/meta/signed-exchange/reporting/sxg-reporting-prefetch-cert_fetch_error-downgraded.tentative.html.ini
index cad004a5c892..87bd13d8a196 100644
--- a/testing/web-platform/meta/signed-exchange/reporting/sxg-reporting-prefetch-cert_fetch_error-downgraded.tentative.html.ini
+++ b/testing/web-platform/meta/signed-exchange/reporting/sxg-reporting-prefetch-cert_fetch_error-downgraded.tentative.html.ini
@@ -7,7 +7,7 @@
     if not debug and webrender and e10s and (os == "win") and (version == "10.0.17134") and (processor == "x86_64") and (bits == 64): TIMEOUT
     if not debug and webrender and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86_64") and (bits == 64): TIMEOUT
     if not debug and not webrender and e10s and (os == "mac") and (version == "OS X 10.10.5") and (processor == "x86_64") and (bits == 64): TIMEOUT
-    if (os == "win") and (processor == "aarch64"): TIMEOUT # 1538379
+    if (os == "win") and (processor == "aarch64"): OK # disabled in 1538379, re-enabled to FAIL in 1539693
   [SXG reporting test of sxg.failed downgraded from sxg.cert_fetch_error for prefetch.]
     expected:
       if debug and not webrender and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86") and (bits == 32): FAIL
@@ -27,5 +27,5 @@
       if not debug and webrender and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86_64") and (bits == 64): TIMEOUT
       if not debug and webrender and e10s and (os == "win") and (version == "10.0.17134") and (processor == "x86_64") and (bits == 64): TIMEOUT
       if not debug and not webrender and e10s and (os == "mac") and (version == "OS X 10.10.5") and (processor == "x86_64") and (bits == 64): TIMEOUT
-      if (os == "win") and (processor == "aarch64"): TIMEOUT # 1538379
+      if (os == "win") and (processor == "aarch64"): FAIL # disabled in 1538379, re-enabled to FAIL in 1539693
 
diff --git a/testing/web-platform/meta/signed-exchange/reporting/sxg-reporting-prefetch-cert_fetch_error.tentative.html.ini b/testing/web-platform/meta/signed-exchange/reporting/sxg-reporting-prefetch-cert_fetch_error.tentative.html.ini
index 5773cc41e0c4..6355c1dd3cd3 100644
--- a/testing/web-platform/meta/signed-exchange/reporting/sxg-reporting-prefetch-cert_fetch_error.tentative.html.ini
+++ b/testing/web-platform/meta/signed-exchange/reporting/sxg-reporting-prefetch-cert_fetch_error.tentative.html.ini
@@ -7,7 +7,7 @@
     if not debug and webrender and e10s and (os == "win") and (version == "10.0.17134") and (processor == "x86_64") and (bits == 64): TIMEOUT
     if not debug and webrender and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86_64") and (bits == 64): TIMEOUT
     if not debug and not webrender and e10s and (os == "mac") and (version == "OS X 10.10.5") and (processor == "x86_64") and (bits == 64): TIMEOUT
-    if (os == "win") and (processor == "aarch64"): TIMEOUT # 1538379
+    if (os == "win") and (processor == "aarch64"): OK # disabled in 1538379, re-enabled to FAIL in 1539693
   [SXG reporting test of sxg.cert_fetch_error for prefetch.]
     expected:
       if debug and not webrender and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86") and (bits == 32): FAIL
@@ -27,5 +27,5 @@
       if not debug and webrender and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86_64") and (bits == 64): TIMEOUT
       if not debug and webrender and e10s and (os == "win") and (version == "10.0.17134") and (processor == "x86_64") and (bits == 64): TIMEOUT
       if not debug and not webrender and e10s and (os == "mac") and (version == "OS X 10.10.5") and (processor == "x86_64") and (bits == 64): TIMEOUT
-      if (os == "win") and (processor == "aarch64"): TIMEOUT # 1538379
+      if (os == "win") and (processor == "aarch64"): FAIL # disabled in 1538379, re-enabled to FAIL in 1539693
 
diff --git a/testing/web-platform/meta/signed-exchange/reporting/sxg-reporting-prefetch-cert_parse_error-downgraded.tentative.html.ini b/testing/web-platform/meta/signed-exchange/reporting/sxg-reporting-prefetch-cert_parse_error-downgraded.tentative.html.ini
index de106880e724..2f3cd277dfea 100644
--- a/testing/web-platform/meta/signed-exchange/reporting/sxg-reporting-prefetch-cert_parse_error-downgraded.tentative.html.ini
+++ b/testing/web-platform/meta/signed-exchange/reporting/sxg-reporting-prefetch-cert_parse_error-downgraded.tentative.html.ini
@@ -7,7 +7,7 @@
     if not debug and webrender and e10s and (os == "win") and (version == "10.0.17134") and (processor == "x86_64") and (bits == 64): TIMEOUT
     if not debug and webrender and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86_64") and (bits == 64): TIMEOUT
     if not debug and not webrender and e10s and (os == "mac") and (version == "OS X 10.10.5") and (processor == "x86_64") and (bits == 64): TIMEOUT
-    if (os == "win") and (processor == "aarch64"): TIMEOUT # 1538379
+    if (os == "win") and (processor == "aarch64"): OK # disabled in 1538379, re-enabled to FAIL in 1539693
   [SXG reporting test of sxg.failed downgraded from sxg.cert_parse_error for prefetch.]
     expected:
       if debug and not webrender and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86") and (bits == 32): FAIL
@@ -27,5 +27,5 @@
       if not debug and webrender and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86_64") and (bits == 64): TIMEOUT
       if not debug and webrender and e10s and (os == "win") and (version == "10.0.17134") and (processor == "x86_64") and (bits == 64): TIMEOUT
       if not debug and not webrender and e10s and (os == "mac") and (version == "OS X 10.10.5") and (processor == "x86_64") and (bits == 64): TIMEOUT
-      if (os == "win") and (processor == "aarch64"): TIMEOUT # 1538379
+      if (os == "win") and (processor == "aarch64"): FAIL # disabled in 1538379, re-enabled to FAIL in 1539693
 
diff --git a/testing/web-platform/meta/signed-exchange/reporting/sxg-reporting-prefetch-cert_parse_error.tentative.html.ini b/testing/web-platform/meta/signed-exchange/reporting/sxg-reporting-prefetch-cert_parse_error.tentative.html.ini
index 583a90c74255..b2a0a645366f 100644
--- a/testing/web-platform/meta/signed-exchange/reporting/sxg-reporting-prefetch-cert_parse_error.tentative.html.ini
+++ b/testing/web-platform/meta/signed-exchange/reporting/sxg-reporting-prefetch-cert_parse_error.tentative.html.ini
@@ -7,7 +7,7 @@
     if not debug and webrender and e10s and (os == "win") and (version == "10.0.17134") and (processor == "x86_64") and (bits == 64): TIMEOUT
     if not debug and webrender and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86_64") and (bits == 64): TIMEOUT
     if not debug and not webrender and e10s and (os == "mac") and (version == "OS X 10.10.5") and (processor == "x86_64") and (bits == 64): TIMEOUT
-    if (os == "win") and (processor == "aarch64"): TIMEOUT # 1538379
+    if (os == "win") and (processor == "aarch64"): OK # disabled in 1538379, re-enabled to FAIL in 1539693
   [SXG reporting test of sxg.cert_parse_error for prefetch.]
     expected:
       if debug and not webrender and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86") and (bits == 32): FAIL
@@ -27,5 +27,5 @@
       if not debug and webrender and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86_64") and (bits == 64): TIMEOUT
       if not debug and webrender and e10s and (os == "win") and (version == "10.0.17134") and (processor == "x86_64") and (bits == 64): TIMEOUT
       if not debug and not webrender and e10s and (os == "mac") and (version == "OS X 10.10.5") and (processor == "x86_64") and (bits == 64): TIMEOUT
-      if (os == "win") and (processor == "aarch64"): TIMEOUT # 1538379
+      if (os == "win") and (processor == "aarch64"): FAIL # disabled in 1538379, re-enabled to FAIL in 1539693
 
diff --git a/testing/web-platform/meta/signed-exchange/reporting/sxg-reporting-prefetch-cert_verification_error-downgraded.tentative.html.ini b/testing/web-platform/meta/signed-exchange/reporting/sxg-reporting-prefetch-cert_verification_error-downgraded.tentative.html.ini
index a4d85b8b313d..9db92fc81e8e 100644
--- a/testing/web-platform/meta/signed-exchange/reporting/sxg-reporting-prefetch-cert_verification_error-downgraded.tentative.html.ini
+++ b/testing/web-platform/meta/signed-exchange/reporting/sxg-reporting-prefetch-cert_verification_error-downgraded.tentative.html.ini
@@ -7,7 +7,7 @@
     if not debug and webrender and e10s and (os == "win") and (version == "10.0.17134") and (processor == "x86_64") and (bits == 64): TIMEOUT
     if not debug and webrender and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86_64") and (bits == 64): TIMEOUT
     if not debug and not webrender and e10s and (os == "mac") and (version == "OS X 10.10.5") and (processor == "x86_64") and (bits == 64): TIMEOUT
-    if (os == "win") and (processor == "aarch64"): TIMEOUT # 1538379
+    if (os == "win") and (processor == "aarch64"): OK # disabled in 1538379, re-enabled to FAIL in 1539693
   [SXG reporting test of sxg.failed downgraded from sxg.cert_verification_error for prefetch.]
     expected:
       if debug and not webrender and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86") and (bits == 32): FAIL
@@ -27,5 +27,5 @@
       if not debug and webrender and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86_64") and (bits == 64): TIMEOUT
       if not debug and webrender and e10s and (os == "win") and (version == "10.0.17134") and (processor == "x86_64") and (bits == 64): TIMEOUT
       if not debug and not webrender and e10s and (os == "mac") and (version == "OS X 10.10.5") and (processor == "x86_64") and (bits == 64): TIMEOUT
-      if (os == "win") and (processor == "aarch64"): TIMEOUT # 1538379
+      if (os == "win") and (processor == "aarch64"): FAIL # disabled in 1538379, re-enabled to FAIL in 1539693
 
diff --git a/testing/web-platform/meta/signed-exchange/reporting/sxg-reporting-prefetch-cert_verification_error.tentative.html.ini b/testing/web-platform/meta/signed-exchange/reporting/sxg-reporting-prefetch-cert_verification_error.tentative.html.ini
index e8903ac20d9e..cb15bc63dd41 100644
--- a/testing/web-platform/meta/signed-exchange/reporting/sxg-reporting-prefetch-cert_verification_error.tentative.html.ini
+++ b/testing/web-platform/meta/signed-exchange/reporting/sxg-reporting-prefetch-cert_verification_error.tentative.html.ini
@@ -7,7 +7,7 @@
     if not debug and webrender and e10s and (os == "win") and (version == "10.0.17134") and (processor == "x86_64") and (bits == 64): TIMEOUT
     if not debug and webrender and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86_64") and (bits == 64): TIMEOUT
     if not debug and not webrender and e10s and (os == "mac") and (version == "OS X 10.10.5") and (processor == "x86_64") and (bits == 64): TIMEOUT
-    if (os == "win") and (processor == "aarch64"): TIMEOUT # 1538379
+    if (os == "win") and (processor == "aarch64"): OK # disabled in 1538379, re-enabled to FAIL in 1539693
   [SXG reporting test of sxg.cert_verification_error for prefetch.]
     expected:
       if debug and not webrender and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86") and (bits == 32): FAIL
@@ -27,5 +27,5 @@
       if not debug and webrender and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86_64") and (bits == 64): TIMEOUT
       if not debug and webrender and e10s and (os == "win") and (version == "10.0.17134") and (processor == "x86_64") and (bits == 64): TIMEOUT
       if not debug and not webrender and e10s and (os == "mac") and (version == "OS X 10.10.5") and (processor == "x86_64") and (bits == 64): TIMEOUT
-      if (os == "win") and (processor == "aarch64"): TIMEOUT # 1538379
+      if (os == "win") and (processor == "aarch64"): FAIL # disabled in 1538379, re-enabled to FAIL in 1539693
 
diff --git a/testing/web-platform/meta/signed-exchange/reporting/sxg-reporting-prefetch-invalid_integrity_header.tentative.html.ini b/testing/web-platform/meta/signed-exchange/reporting/sxg-reporting-prefetch-invalid_integrity_header.tentative.html.ini
index 51ec9fe74b97..bfae04c323f3 100644
--- a/testing/web-platform/meta/signed-exchange/reporting/sxg-reporting-prefetch-invalid_integrity_header.tentative.html.ini
+++ b/testing/web-platform/meta/signed-exchange/reporting/sxg-reporting-prefetch-invalid_integrity_header.tentative.html.ini
@@ -7,7 +7,7 @@
     if not debug and webrender and e10s and (os == "win") and (version == "10.0.17134") and (processor == "x86_64") and (bits == 64): TIMEOUT
     if not debug and webrender and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86_64") and (bits == 64): TIMEOUT
     if not debug and not webrender and e10s and (os == "mac") and (version == "OS X 10.10.5") and (processor == "x86_64") and (bits == 64): TIMEOUT
-    if (os == "win") and (processor == "aarch64"): TIMEOUT # 1538379
+    if (os == "win") and (processor == "aarch64"): OK # disabled in 1538379, re-enabled to FAIL in 1539693
   [SXG reporting test of sxg.invalid_integrity_header for prefetch.]
     expected:
       if debug and not webrender and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86") and (bits == 32): FAIL
@@ -27,5 +27,5 @@
       if not debug and webrender and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86_64") and (bits == 64): TIMEOUT
       if not debug and webrender and e10s and (os == "win") and (version == "10.0.17134") and (processor == "x86_64") and (bits == 64): TIMEOUT
       if not debug and not webrender and e10s and (os == "mac") and (version == "OS X 10.10.5") and (processor == "x86_64") and (bits == 64): TIMEOUT
-      if (os == "win") and (processor == "aarch64"): TIMEOUT # 1538379
+      if (os == "win") and (processor == "aarch64"): FAIL # disabled in 1538379, re-enabled to FAIL in 1539693
 
diff --git a/testing/web-platform/meta/signed-exchange/reporting/sxg-reporting-prefetch-mi_error.tentative.html.ini b/testing/web-platform/meta/signed-exchange/reporting/sxg-reporting-prefetch-mi_error.tentative.html.ini
index 62295e5e1ab5..184664b16985 100644
--- a/testing/web-platform/meta/signed-exchange/reporting/sxg-reporting-prefetch-mi_error.tentative.html.ini
+++ b/testing/web-platform/meta/signed-exchange/reporting/sxg-reporting-prefetch-mi_error.tentative.html.ini
@@ -7,7 +7,7 @@
     if not debug and webrender and e10s and (os == "win") and (version == "10.0.17134") and (processor == "x86_64") and (bits == 64): TIMEOUT
     if not debug and webrender and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86_64") and (bits == 64): TIMEOUT
     if not debug and not webrender and e10s and (os == "mac") and (version == "OS X 10.10.5") and (processor == "x86_64") and (bits == 64): TIMEOUT
-    if (os == "win") and (processor == "aarch64"): TIMEOUT # 1538379
+    if (os == "win") and (processor == "aarch64"): OK # disabled in 1538379, re-enabled to FAIL in 1539693
   [SXG reporting test of sxg.mi_error for prefetch.]
     expected:
       if debug and not webrender and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86") and (bits == 32): FAIL
@@ -27,5 +27,5 @@
       if not debug and webrender and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86_64") and (bits == 64): TIMEOUT
       if not debug and webrender and e10s and (os == "win") and (version == "10.0.17134") and (processor == "x86_64") and (bits == 64): TIMEOUT
       if not debug and not webrender and e10s and (os == "mac") and (version == "OS X 10.10.5") and (processor == "x86_64") and (bits == 64): TIMEOUT
-      if (os == "win") and (processor == "aarch64"): TIMEOUT # 1538379
+      if (os == "win") and (processor == "aarch64"): FAIL # disabled in 1538379, re-enabled to FAIL in 1539693
 
diff --git a/testing/web-platform/meta/signed-exchange/reporting/sxg-reporting-prefetch-ok.tentative.html.ini b/testing/web-platform/meta/signed-exchange/reporting/sxg-reporting-prefetch-ok.tentative.html.ini
index 7dc382149831..4854dd788bdd 100644
--- a/testing/web-platform/meta/signed-exchange/reporting/sxg-reporting-prefetch-ok.tentative.html.ini
+++ b/testing/web-platform/meta/signed-exchange/reporting/sxg-reporting-prefetch-ok.tentative.html.ini
@@ -7,7 +7,7 @@
     if not debug and webrender and e10s and (os == "win") and (version == "10.0.17134") and (processor == "x86_64") and (bits == 64): TIMEOUT
     if not debug and webrender and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86_64") and (bits == 64): TIMEOUT
     if not debug and not webrender and e10s and (os == "mac") and (version == "OS X 10.10.5") and (processor == "x86_64") and (bits == 64): TIMEOUT
-    if (os == "win") and (processor == "aarch64"): TIMEOUT # 1538379
+    if (os == "win") and (processor == "aarch64"): OK # disabled in 1538379, re-enabled to FAIL in 1539693
   [SXG success report must be sent for prefetching.]
     expected:
       if not debug and not webrender and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86") and (bits == 32): TIMEOUT
@@ -27,5 +27,5 @@
       if not debug and webrender and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86_64") and (bits == 64): TIMEOUT
       if not debug and webrender and e10s and (os == "win") and (version == "10.0.17134") and (processor == "x86_64") and (bits == 64): TIMEOUT
       if not debug and not webrender and e10s and (os == "mac") and (version == "OS X 10.10.5") and (processor == "x86_64") and (bits == 64): TIMEOUT
-      if (os == "win") and (processor == "aarch64"): TIMEOUT # 1538379
+      if (os == "win") and (processor == "aarch64"): FAIL # disabled in 1538379, re-enabled to FAIL in 1539693
 
diff --git a/testing/web-platform/meta/signed-exchange/reporting/sxg-reporting-prefetch-parse_error.tentative.html.ini b/testing/web-platform/meta/signed-exchange/reporting/sxg-reporting-prefetch-parse_error.tentative.html.ini
index a400933c070b..00f4eb2fb4d2 100644
--- a/testing/web-platform/meta/signed-exchange/reporting/sxg-reporting-prefetch-parse_error.tentative.html.ini
+++ b/testing/web-platform/meta/signed-exchange/reporting/sxg-reporting-prefetch-parse_error.tentative.html.ini
@@ -7,7 +7,7 @@
     if not debug and webrender and e10s and (os == "win") and (version == "10.0.17134") and (processor == "x86_64") and (bits == 64): TIMEOUT
     if not debug and webrender and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86_64") and (bits == 64): TIMEOUT
     if not debug and not webrender and e10s and (os == "mac") and (version == "OS X 10.10.5") and (processor == "x86_64") and (bits == 64): TIMEOUT
-    if (os == "win") and (processor == "aarch64"): TIMEOUT # 1538379
+    if (os == "win") and (processor == "aarch64"): OK # disabled in 1538379, re-enabled to FAIL in 1539693
   [SXG reporting test of sxg.parse_error for prefetch.]
     expected:
       if debug and not webrender and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86") and (bits == 32): FAIL
@@ -27,5 +27,5 @@
       if not debug and webrender and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86_64") and (bits == 64): TIMEOUT
       if not debug and webrender and e10s and (os == "win") and (version == "10.0.17134") and (processor == "x86_64") and (bits == 64): TIMEOUT
       if not debug and not webrender and e10s and (os == "mac") and (version == "OS X 10.10.5") and (processor == "x86_64") and (bits == 64): TIMEOUT
-      if (os == "win") and (processor == "aarch64"): TIMEOUT # 1538379
+      if (os == "win") and (processor == "aarch64"): FAIL # disabled in 1538379, re-enabled to FAIL in 1539693
 
diff --git a/testing/web-platform/meta/signed-exchange/reporting/sxg-reporting-prefetch-signature_verification_error-downgraded.tentative.html.ini b/testing/web-platform/meta/signed-exchange/reporting/sxg-reporting-prefetch-signature_verification_error-downgraded.tentative.html.ini
index 006303dcf2f2..341fe74767b9 100644
--- a/testing/web-platform/meta/signed-exchange/reporting/sxg-reporting-prefetch-signature_verification_error-downgraded.tentative.html.ini
+++ b/testing/web-platform/meta/signed-exchange/reporting/sxg-reporting-prefetch-signature_verification_error-downgraded.tentative.html.ini
@@ -7,7 +7,7 @@
     if not debug and webrender and e10s and (os == "win") and (version == "10.0.17134") and (processor == "x86_64") and (bits == 64): TIMEOUT
     if not debug and webrender and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86_64") and (bits == 64): TIMEOUT
     if not debug and not webrender and e10s and (os == "mac") and (version == "OS X 10.10.5") and (processor == "x86_64") and (bits == 64): TIMEOUT
-    if (os == "win") and (processor == "aarch64"): TIMEOUT # 1538379
+    if (os == "win") and (processor == "aarch64"): OK # disabled in 1538379, re-enabled to FAIL in 1539693
   [SXG reporting test of sxg.failed downgraded from sxg.signature_verification_error for prefetch.]
     expected:
       if debug and not webrender and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86") and (bits == 32): FAIL
@@ -27,5 +27,5 @@
       if not debug and webrender and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86_64") and (bits == 64): TIMEOUT
       if not debug and webrender and e10s and (os == "win") and (version == "10.0.17134") and (processor == "x86_64") and (bits == 64): TIMEOUT
       if not debug and not webrender and e10s and (os == "mac") and (version == "OS X 10.10.5") and (processor == "x86_64") and (bits == 64): TIMEOUT
-      if (os == "win") and (processor == "aarch64"): TIMEOUT # 1538379
+      if (os == "win") and (processor == "aarch64"): FAIL # disabled in 1538379, re-enabled to FAIL in 1539693
 
diff --git a/testing/web-platform/meta/signed-exchange/reporting/sxg-reporting-prefetch-signature_verification_error.tentative.html.ini b/testing/web-platform/meta/signed-exchange/reporting/sxg-reporting-prefetch-signature_verification_error.tentative.html.ini
index 567b6315da38..6e79ece968a9 100644
--- a/testing/web-platform/meta/signed-exchange/reporting/sxg-reporting-prefetch-signature_verification_error.tentative.html.ini
+++ b/testing/web-platform/meta/signed-exchange/reporting/sxg-reporting-prefetch-signature_verification_error.tentative.html.ini
@@ -7,7 +7,7 @@
     if not debug and webrender and e10s and (os == "win") and (version == "10.0.17134") and (processor == "x86_64") and (bits == 64): TIMEOUT
     if not debug and webrender and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86_64") and (bits == 64): TIMEOUT
     if not debug and not webrender and e10s and (os == "mac") and (version == "OS X 10.10.5") and (processor == "x86_64") and (bits == 64): TIMEOUT
-    if (os == "win") and (processor == "aarch64"): TIMEOUT # 1538379
+    if (os == "win") and (processor == "aarch64"): OK # disabled in 1538379, re-enabled to FAIL in 1539693
   [SXG reporting test of sxg.signature_verification_error for prefetch.]
     expected:
       if debug and not webrender and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86") and (bits == 32): FAIL
@@ -27,5 +27,5 @@
       if not debug and webrender and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86_64") and (bits == 64): TIMEOUT
       if not debug and webrender and e10s and (os == "win") and (version == "10.0.17134") and (processor == "x86_64") and (bits == 64): TIMEOUT
       if not debug and not webrender and e10s and (os == "mac") and (version == "OS X 10.10.5") and (processor == "x86_64") and (bits == 64): TIMEOUT
-      if (os == "win") and (processor == "aarch64"): TIMEOUT # 1538379
+      if (os == "win") and (processor == "aarch64"): FAIL # disabled in 1538379, re-enabled to FAIL in 1539693
 
diff --git a/testing/web-platform/meta/webrtc/RTCDTMFSender-ontonechange.https.html.ini b/testing/web-platform/meta/webrtc/RTCDTMFSender-ontonechange.https.html.ini
index de4b3bd00b54..81b0a165d836 100644
--- a/testing/web-platform/meta/webrtc/RTCDTMFSender-ontonechange.https.html.ini
+++ b/testing/web-platform/meta/webrtc/RTCDTMFSender-ontonechange.https.html.ini
@@ -1,6 +1,4 @@
 [RTCDTMFSender-ontonechange.https.html]
-  disabled:
-    if (os == 'win' and processor == 'aarch64'): https://bugzilla.mozilla.org/show_bug.cgi?id=1536916
   [Calling insertDTMF() in the middle of tonechange events should cause future tonechanges to be updated to new tones]
     expected: FAIL
     bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1531825
diff --git a/testing/web-platform/meta/webrtc/RTCPeerConnection-getStats.https.html.ini b/testing/web-platform/meta/webrtc/RTCPeerConnection-getStats.https.html.ini
index 960bc8f80457..33e982d5f92b 100644
--- a/testing/web-platform/meta/webrtc/RTCPeerConnection-getStats.https.html.ini
+++ b/testing/web-platform/meta/webrtc/RTCPeerConnection-getStats.https.html.ini
@@ -1,6 +1,4 @@
 [RTCPeerConnection-getStats.https.html]
-  expected:
-    if (os == 'win' and processor == 'aarch64'): TIMEOUT # bug 1536919
   [getStats() with no argument should return stats report containing peer-connection stats on an empty PC]
     expected: FAIL
     bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1531087
@@ -14,17 +12,11 @@
     bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1225720
 
   [getStats() on track associated with RtpSender should return stats report containing outbound-rtp stats]
-    disabled:
-      if (os == 'win' and processor == 'aarch64'): https://bugzilla.mozilla.org/show_bug.cgi?id=1536919
-    expected:
-      FAIL
+    expected: FAIL
     bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1225720
 
   [getStats() on track associated with RtpReceiver should return stats report containing inbound-rtp stats]
-    disabled:
-      if (os == 'win' and processor == 'aarch64'): https://bugzilla.mozilla.org/show_bug.cgi?id=1536919
-    expected:
-      FAIL
+    expected: FAIL
     bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1225723
 
   [getStats() with connected peer connections having tracks and data channel should return all mandatory to implement stats]
diff --git a/testing/web-platform/meta/webrtc/RTCPeerConnection-iceConnectionState.https.html.ini b/testing/web-platform/meta/webrtc/RTCPeerConnection-iceConnectionState.https.html.ini
index 8cd82642694f..c1e14f2dc6e9 100644
--- a/testing/web-platform/meta/webrtc/RTCPeerConnection-iceConnectionState.https.html.ini
+++ b/testing/web-platform/meta/webrtc/RTCPeerConnection-iceConnectionState.https.html.ini
@@ -1,6 +1,4 @@
 [RTCPeerConnection-iceConnectionState.https.html]
-  disabled:
-    if (os == 'win' and processor == 'aarch64'): https://bugzilla.mozilla.org/show_bug.cgi?id=1538283
   [connection with one data channel should eventually have connected connection state]
     expected: FAIL
     bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1278299
diff --git a/testing/web-platform/meta/webrtc/RTCPeerConnection-remote-track-mute.https.html.ini b/testing/web-platform/meta/webrtc/RTCPeerConnection-remote-track-mute.https.html.ini
index 5ff505c8c852..0b461b75c6b5 100644
--- a/testing/web-platform/meta/webrtc/RTCPeerConnection-remote-track-mute.https.html.ini
+++ b/testing/web-platform/meta/webrtc/RTCPeerConnection-remote-track-mute.https.html.ini
@@ -1,15 +1,5 @@
 [RTCPeerConnection-remote-track-mute.https.html]
   expected: TIMEOUT
   [pc.close() mutes remote tracks]
-    disabled:
-      if (os == 'win' and processor == 'aarch64'): https://bugzilla.mozilla.org/show_bug.cgi?id=1536922
     expected: TIMEOUT
-    bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1531107
-
-  [Changing transceiver direction to 'inactive' mutes the remote track]
-    disabled:
-      if (os == 'win' and processor == 'aarch64'): https://bugzilla.mozilla.org/show_bug.cgi?id=1536922
-
-  [Changing transceiver direction to 'sendrecv' unmutes the remote track]
-    disabled:
-      if (os == 'win' and processor == 'aarch64'): https://bugzilla.mozilla.org/show_bug.cgi?id=1536922
\ No newline at end of file
+    bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1531107
\ No newline at end of file
diff --git a/testing/web-platform/meta/webrtc/RTCPeerConnection-setRemoteDescription-tracks.https.html.ini b/testing/web-platform/meta/webrtc/RTCPeerConnection-setRemoteDescription-tracks.https.html.ini
index 61c3af795eef..b796b4f7030c 100644
--- a/testing/web-platform/meta/webrtc/RTCPeerConnection-setRemoteDescription-tracks.https.html.ini
+++ b/testing/web-platform/meta/webrtc/RTCPeerConnection-setRemoteDescription-tracks.https.html.ini
@@ -1,3 +1 @@
 [RTCPeerConnection-setRemoteDescription-tracks.https.html]
-  disabled:
-    if (os == 'win' and processor == 'aarch64'): https://bugzilla.mozilla.org/show_bug.cgi?id=1536925
\ No newline at end of file