diff --git a/testing/profiles/web-platform/user.js b/testing/profiles/web-platform/user.js
index aa39ce5eb5f2..892c86b817d5 100644
--- a/testing/profiles/web-platform/user.js
+++ b/testing/profiles/web-platform/user.js
@@ -24,3 +24,5 @@ user_pref("places.history.enabled", false);
 user_pref("toolkit.startup.max_resumed_crashes", -1);
 // Disable antialiasing for the Ahem font.
 user_pref("gfx.font_ahem_antialias_none", true);
+// Disable antiphishing popup
+user_pref("network.http.phishy-userpass-length", 255);
diff --git a/testing/web-platform/meta/fetch/security/embedded-credentials.tentative.sub.html.ini b/testing/web-platform/meta/fetch/security/embedded-credentials.tentative.sub.html.ini
index 5ae51ff6424b..61ec48736411 100644
--- a/testing/web-platform/meta/fetch/security/embedded-credentials.tentative.sub.html.ini
+++ b/testing/web-platform/meta/fetch/security/embedded-credentials.tentative.sub.html.ini
@@ -1,19 +1,4 @@
 [embedded-credentials.tentative.sub.html]
-  expected:
-    if debug and not webrender and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86") and (bits == 32): CRASH
-    if debug and webrender and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86_64") and (bits == 64): CRASH
-    if not debug and not webrender and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86_64") and (bits == 64): CRASH
-    if not debug and webrender and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86_64") and (bits == 64): CRASH
-    if debug and not webrender and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86_64") and (bits == 64): CRASH
-    if not debug and not webrender and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86") and (bits == 32): CRASH
-    if debug and not webrender and e10s and (os == "mac") and (version == "OS X 10.10.5") and (processor == "x86_64") and (bits == 64): CRASH
-    if debug and not webrender and e10s and (os == "win") and (version == "6.1.7601") and (processor == "x86") and (bits == 32): CRASH
-    if not debug and not webrender and e10s and (os == "win") and (version == "6.1.7601") and (processor == "x86") and (bits == 32): CRASH
-    if debug and not webrender and e10s and (os == "win") and (version == "10.0.15063") and (processor == "x86_64") and (bits == 64): OK
-    if not debug and not webrender and e10s and (os == "win") and (version == "10.0.15063") and (processor == "x86_64") and (bits == 64): CRASH
-    if debug and not webrender and not e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86") and (bits == 32): CRASH
-    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): CRASH
-    ERROR
   [Embedded credentials are treated as network errors in frames.]
     expected: FAIL