diff --git a/browser/base/content/test/webextensions/head.js b/browser/base/content/test/webextensions/head.js
index 28d4ce4bfa9b..99f2002bd3e1 100644
--- a/browser/base/content/test/webextensions/head.js
+++ b/browser/base/content/test/webextensions/head.js
@@ -474,7 +474,7 @@ async function interactiveUpdateTest(autoUpdate, checkFn) {
   await checkPromise;
 
   BrowserTestUtils.removeTab(gBrowser.selectedTab);
-  addon.uninstall();
+  await addon.uninstall();
   await SpecialPowers.popPrefEnv();
 }
 
@@ -501,7 +501,7 @@ add_task(async function() {
     for (let addon of await AddonManager.getAllAddons()) {
       if (!existingAddons.has(addon.id)) {
         ok(false, `Addon ${addon.id} was left installed at the end of the test`);
-        addon.uninstall();
+        await addon.uninstall();
       }
     }
   });
diff --git a/layout/base/nsIPresShell.h b/layout/base/nsIPresShell.h
index 04de0fdb01bc..32a926c5c3f8 100644
--- a/layout/base/nsIPresShell.h
+++ b/layout/base/nsIPresShell.h
@@ -1617,15 +1617,15 @@ protected:
   bool DetermineFontSizeInflationState();
 
   void RecordAlloc(void* aPtr) {
-#ifdef DEBUG
-    MOZ_ASSERT(!mAllocatedPointers.Contains(aPtr));
+#ifdef MOZ_DIAGNOSTIC_ASSERT_ENABLED
+    MOZ_DIAGNOSTIC_ASSERT(!mAllocatedPointers.Contains(aPtr));
     mAllocatedPointers.PutEntry(aPtr);
 #endif
   }
 
   void RecordFree(void* aPtr) {
-#ifdef DEBUG
-    MOZ_ASSERT(mAllocatedPointers.Contains(aPtr));
+#ifdef MOZ_DIAGNOSTIC_ASSERT_ENABLED
+    MOZ_DIAGNOSTIC_ASSERT(mAllocatedPointers.Contains(aPtr));
     mAllocatedPointers.RemoveEntry(aPtr);
 #endif
   }
@@ -1717,7 +1717,9 @@ protected:
 
 #ifdef DEBUG
   nsIFrame*                 mDrawEventTargetFrame;
+#endif
 
+#ifdef MOZ_DIAGNOSTIC_ASSERT_ENABLED
   // We track allocated pointers in a debug-only hashtable to assert against
   // missing/double frees.
   nsTHashtable<nsPtrHashKey<void>> mAllocatedPointers;
diff --git a/layout/generic/nsFrame.cpp b/layout/generic/nsFrame.cpp
index a4f3ea8e678e..aa4c9503824d 100644
--- a/layout/generic/nsFrame.cpp
+++ b/layout/generic/nsFrame.cpp
@@ -612,6 +612,7 @@ nsFrame::Init(nsIContent*       aContent,
 
   mContent = aContent;
   mParent = aParent;
+  MOZ_DIAGNOSTIC_ASSERT(!mParent || PresShell() == mParent->PresShell());
 
   if (aPrevInFlow) {
     mWritingMode = aPrevInFlow->GetWritingMode();
@@ -10914,6 +10915,7 @@ nsIFrame::SetParent(nsContainerFrame* aParent)
 
   // Note that the current mParent may already be destroyed at this point.
   mParent = aParent;
+  MOZ_DIAGNOSTIC_ASSERT(!mParent || PresShell() == mParent->PresShell());
   if (::IsXULBoxWrapped(this)) {
     ::InitBoxMetrics(this, true);
   } else {
diff --git a/layout/generic/nsIFrame.h b/layout/generic/nsIFrame.h
index 4124e792b8a5..c1665c7b30e9 100644
--- a/layout/generic/nsIFrame.h
+++ b/layout/generic/nsIFrame.h
@@ -780,6 +780,7 @@ public:
   void SetComputedStyle(ComputedStyle* aStyle)
   {
     if (aStyle != mComputedStyle) {
+      MOZ_DIAGNOSTIC_ASSERT(PresShell() == aStyle->PresContextForFrame()->PresShell());
       RefPtr<ComputedStyle> oldComputedStyle = mComputedStyle.forget();
       mComputedStyle = aStyle;
       DidSetComputedStyle(oldComputedStyle);
@@ -795,6 +796,7 @@ public:
   void SetComputedStyleWithoutNotification(ComputedStyle* aStyle)
   {
     if (aStyle != mComputedStyle) {
+      MOZ_DIAGNOSTIC_ASSERT(PresShell() == aStyle->PresContextForFrame()->PresShell());
       mComputedStyle = aStyle;
     }
   }
diff --git a/mobile/android/app/mobile.js b/mobile/android/app/mobile.js
index b3d97dfd5759..bdcaffa9da7d 100644
--- a/mobile/android/app/mobile.js
+++ b/mobile/android/app/mobile.js
@@ -106,10 +106,6 @@ pref("network.http.max-persistent-connections-per-proxy", 20);
 pref("network.http.spdy.push-allowance", 32768);
 pref("network.http.spdy.default-hpack-buffer", 4096); // 4k
 
-// Racing the cache with the network should be disabled to prevent accidental
-// data usage.
-pref("network.http.rcwn.enabled", false);
-
 // See bug 545869 for details on why these are set the way they are
 pref("network.buffer.cache.count", 24);
 pref("network.buffer.cache.size",  16384);
diff --git a/modules/libpref/init/all.js b/modules/libpref/init/all.js
index 45a92bfd64d0..016c9195e38d 100644
--- a/modules/libpref/init/all.js
+++ b/modules/libpref/init/all.js
@@ -1322,10 +1322,11 @@ pref("dom.event.clipboardevents.enabled",   true);
 pref("dom.event.highrestimestamp.enabled",  true);
 pref("dom.event.coalesce_mouse_move",       true);
 
-pref("dom.webcomponents.shadowdom.enabled", false);
 #ifdef NIGHTLY_BUILD
+pref("dom.webcomponents.shadowdom.enabled", true);
 pref("dom.webcomponents.customelements.enabled", true);
 #else
+pref("dom.webcomponents.shadowdom.enabled", false);
 pref("dom.webcomponents.customelements.enabled", false);
 #endif
 
diff --git a/netwerk/protocol/http/nsHttpChannel.cpp b/netwerk/protocol/http/nsHttpChannel.cpp
index d2aae0684887..5a415b3f2a7d 100644
--- a/netwerk/protocol/http/nsHttpChannel.cpp
+++ b/netwerk/protocol/http/nsHttpChannel.cpp
@@ -112,6 +112,7 @@
 #include "nsIMIMEInputStream.h"
 #include "nsIMultiplexInputStream.h"
 #include "../../cache2/CacheFileUtils.h"
+#include "nsINetworkLinkService.h"
 
 #ifdef MOZ_TASK_TRACER
 #include "GeckoTaskTracer.h"
@@ -9122,6 +9123,23 @@ nsHttpChannel::TriggerNetwork()
 nsresult
 nsHttpChannel::MaybeRaceCacheWithNetwork()
 {
+    nsresult rv;
+
+    nsCOMPtr<nsINetworkLinkService> netLinkSvc =
+        do_GetService(NS_NETWORK_LINK_SERVICE_CONTRACTID, &rv);
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    uint32_t linkType;
+    rv = netLinkSvc->GetLinkType(&linkType);
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    if (!(linkType == nsINetworkLinkService::LINK_TYPE_UNKNOWN ||
+          linkType == nsINetworkLinkService::LINK_TYPE_ETHERNET ||
+          linkType == nsINetworkLinkService::LINK_TYPE_USB ||
+          linkType == nsINetworkLinkService::LINK_TYPE_WIFI)) {
+        return NS_OK;
+    }
+
     // Don't trigger the network if the load flags say so.
     if (mLoadFlags & (LOAD_ONLY_FROM_CACHE | LOAD_NO_NETWORK_IO)) {
         return NS_OK;
diff --git a/testing/specialpowers/content/SpecialPowersObserverAPI.js b/testing/specialpowers/content/SpecialPowersObserverAPI.js
index b7c3ed522940..5ebf4576fa4c 100644
--- a/testing/specialpowers/content/SpecialPowersObserverAPI.js
+++ b/testing/specialpowers/content/SpecialPowersObserverAPI.js
@@ -640,11 +640,9 @@ SpecialPowersObserverAPI.prototype = {
         let id = aMessage.data.id;
         let extension = this._extensions.get(id);
         this._extensions.delete(id);
-        let {setTimeout} = ChromeUtils.import("resource://gre/modules/Timer.jsm", null);
-        let done = () => {
-          setTimeout(() => {
-            this._sendReply(aMessage, "SPExtensionMessage", {id, type: "extensionUnloaded", args: []});
-          }, 0);
+        let done = async () => {
+          await extension._uninstallPromise;
+          this._sendReply(aMessage, "SPExtensionMessage", {id, type: "extensionUnloaded", args: []});
         };
         extension.shutdown().then(done, done);
         return undefined;
diff --git a/testing/web-platform/meta/IndexedDB/interfaces.any.js.ini b/testing/web-platform/meta/IndexedDB/interfaces.any.js.ini
index 8824b094700f..85ac5c4803b6 100644
--- a/testing/web-platform/meta/IndexedDB/interfaces.any.js.ini
+++ b/testing/web-platform/meta/IndexedDB/interfaces.any.js.ini
@@ -2,5 +2,3 @@
   [ImageBitmapRenderingContext interface: existence and properties of interface object]
     expected: FAIL
 
-
-[interfaces.any.html]
diff --git a/testing/web-platform/meta/MANIFEST.json b/testing/web-platform/meta/MANIFEST.json
index 73603977d87f..cc2048f68ab9 100644
--- a/testing/web-platform/meta/MANIFEST.json
+++ b/testing/web-platform/meta/MANIFEST.json
@@ -298645,6 +298645,26 @@
      {}
     ]
    ],
+   "service-workers/service-worker/resources/service-worker-interception-dynamic-import-worker.js": [
+    [
+     {}
+    ]
+   ],
+   "service-workers/service-worker/resources/service-worker-interception-network-worker.js": [
+    [
+     {}
+    ]
+   ],
+   "service-workers/service-worker/resources/service-worker-interception-service-worker.js": [
+    [
+     {}
+    ]
+   ],
+   "service-workers/service-worker/resources/service-worker-interception-static-import-worker.js": [
+    [
+     {}
+    ]
+   ],
    "service-workers/service-worker/resources/shared-worker-controlled.js": [
     [
      {}
@@ -369622,6 +369642,12 @@
      {}
     ]
    ],
+   "service-workers/service-worker/dedicated-worker-service-worker-interception.https.html": [
+    [
+     "/service-workers/service-worker/dedicated-worker-service-worker-interception.https.html",
+     {}
+    ]
+   ],
    "service-workers/service-worker/detached-context.https.html": [
     [
      "/service-workers/service-worker/detached-context.https.html",
@@ -579452,11 +579478,11 @@
    "testharness"
   ],
   "html/semantics/embedded-content/the-img-element/sizes/sizes-dynamic-001-ref.html": [
-   "d2a087e2d55f7d0a2de3a0008c149932151a69f0",
+   "497a115d29e597db7ef08aff11534fd69c449130",
    "support"
   ],
   "html/semantics/embedded-content/the-img-element/sizes/sizes-dynamic-001.html": [
-   "0256768b16722bf4a8e6e1fb41b48e321509610f",
+   "c25df42c0fa9b20cfac886da13c74801c63d8d40",
    "reftest"
   ],
   "html/semantics/embedded-content/the-img-element/sizes/sizes-iframed.sub.html": [
@@ -606627,6 +606653,10 @@
    "8402c159967bb6e91903adc52e7d68c8d2443a72",
    "testharness"
   ],
+  "service-workers/service-worker/dedicated-worker-service-worker-interception.https.html": [
+   "f0eefc8b5ca0e26d87bddd7821bcfcb2a387d6f8",
+   "testharness"
+  ],
   "service-workers/service-worker/detached-context.https.html": [
    "81fc149311b54f92a2daedd81ffaba33fb88e831",
    "testharness"
@@ -608075,6 +608105,22 @@
    "f7c6bb3ba222dc35a09ef806a7c6d145339f9eb2",
    "support"
   ],
+  "service-workers/service-worker/resources/service-worker-interception-dynamic-import-worker.js": [
+   "4b123607e3cb215ed6ebcb1d6c88793c2245be50",
+   "support"
+  ],
+  "service-workers/service-worker/resources/service-worker-interception-network-worker.js": [
+   "d14febde5e8eceecc45e6104bb91fbe41ae6dea7",
+   "support"
+  ],
+  "service-workers/service-worker/resources/service-worker-interception-service-worker.js": [
+   "323d1116c23cd9bfb9d6b14e7d815dfb132e36d0",
+   "support"
+  ],
+  "service-workers/service-worker/resources/service-worker-interception-static-import-worker.js": [
+   "0f321563c9d64c45859f548988d0701e4e6373c5",
+   "support"
+  ],
   "service-workers/service-worker/resources/shared-worker-controlled.js": [
    "9ae937c2e8499991432caa4587eb68fe2998f503",
    "support"
@@ -608684,7 +608730,7 @@
    "testharness"
   ],
   "shadow-dom/input-element-list.html": [
-   "79b4a278f0e35646cfdffeebf8f0523e2772bc9b",
+   "fcfa6fee4ecc1391a457880bad3564778a76127a",
    "testharness"
   ],
   "shadow-dom/layout-slot-no-longer-assigned.html": [
diff --git a/testing/web-platform/meta/WebCryptoAPI/generateKey/successes_AES-CTR.https.any.js.ini b/testing/web-platform/meta/WebCryptoAPI/generateKey/successes_AES-CTR.https.any.js.ini
index 4ae91b8cdcf1..0e4d5edfa62d 100644
--- a/testing/web-platform/meta/WebCryptoAPI/generateKey/successes_AES-CTR.https.any.js.ini
+++ b/testing/web-platform/meta/WebCryptoAPI/generateKey/successes_AES-CTR.https.any.js.ini
@@ -2,5 +2,3 @@
   [Untitled]
     expected: FAIL
 
-
-[successes_AES-CTR.https.any.html]
diff --git a/testing/web-platform/meta/WebCryptoAPI/generateKey/successes_HMAC.https.any.js.ini b/testing/web-platform/meta/WebCryptoAPI/generateKey/successes_HMAC.https.any.js.ini
index b9f66ccb86ac..aa4c25abf56c 100644
--- a/testing/web-platform/meta/WebCryptoAPI/generateKey/successes_HMAC.https.any.js.ini
+++ b/testing/web-platform/meta/WebCryptoAPI/generateKey/successes_HMAC.https.any.js.ini
@@ -2,5 +2,3 @@
   [Untitled]
     expected: FAIL
 
-
-[successes_HMAC.https.any.html]
diff --git a/testing/web-platform/meta/cors/304.htm.ini b/testing/web-platform/meta/cors/304.htm.ini
index c460f632775f..6498aad1cc12 100644
--- a/testing/web-platform/meta/cors/304.htm.ini
+++ b/testing/web-platform/meta/cors/304.htm.ini
@@ -1,2 +1 @@
 prefs: [network.http.rcwn.enabled:false]
-[304.htm]
diff --git a/testing/web-platform/meta/css/cssom-view/cssom-getBoxQuads-001.html.ini b/testing/web-platform/meta/css/cssom-view/cssom-getBoxQuads-001.html.ini
index 3a1f70682543..153286bb8e11 100644
--- a/testing/web-platform/meta/css/cssom-view/cssom-getBoxQuads-001.html.ini
+++ b/testing/web-platform/meta/css/cssom-view/cssom-getBoxQuads-001.html.ini
@@ -1,2 +1 @@
 prefs: [layout.css.getBoxQuads.enabled:true, layout.css.convertFromNode.enabled:true]
-[cssom-getBoxQuads-001.html]
diff --git a/testing/web-platform/meta/css/filter-effects/interfaces.any.js.ini b/testing/web-platform/meta/css/filter-effects/interfaces.any.js.ini
index b7fe9414cb31..ef9431363cd2 100644
--- a/testing/web-platform/meta/css/filter-effects/interfaces.any.js.ini
+++ b/testing/web-platform/meta/css/filter-effects/interfaces.any.js.ini
@@ -29,5 +29,3 @@
   [SVGFEImageElement interface: attribute crossOrigin]
     expected: FAIL
 
-
-[interfaces.any.worker.html]
diff --git a/testing/web-platform/meta/custom-elements/builtin-coverage.html.ini b/testing/web-platform/meta/custom-elements/builtin-coverage.html.ini
index 6caa000af4d3..acff42697901 100644
--- a/testing/web-platform/meta/custom-elements/builtin-coverage.html.ini
+++ b/testing/web-platform/meta/custom-elements/builtin-coverage.html.ini
@@ -330,3 +330,5 @@
   [dialog: Operator 'new' should instantiate a customized built-in element]
     expected: FAIL
 
+  [slot: Operator 'new' should instantiate a customized built-in element]
+    expected: FAIL
diff --git a/testing/web-platform/meta/feature-policy/interfaces.any.js.ini b/testing/web-platform/meta/feature-policy/interfaces.any.js.ini
index c1b53cb2455c..247ad480f273 100644
--- a/testing/web-platform/meta/feature-policy/interfaces.any.js.ini
+++ b/testing/web-platform/meta/feature-policy/interfaces.any.js.ini
@@ -2,5 +2,3 @@
   [HTMLIFrameElement interface: attribute allow]
     expected: FAIL
 
-
-[interfaces.any.worker.html]
diff --git a/testing/web-platform/meta/fetch/api/basic/conditional-get.html.ini b/testing/web-platform/meta/fetch/api/basic/conditional-get.html.ini
index 0e1c8fb86527..6498aad1cc12 100644
--- a/testing/web-platform/meta/fetch/api/basic/conditional-get.html.ini
+++ b/testing/web-platform/meta/fetch/api/basic/conditional-get.html.ini
@@ -1,2 +1 @@
 prefs: [network.http.rcwn.enabled:false]
-[conditional-get.html]
diff --git a/testing/web-platform/meta/fetch/api/request/request-cache-default.html.ini b/testing/web-platform/meta/fetch/api/request/request-cache-default.html.ini
index b5089424c859..6498aad1cc12 100644
--- a/testing/web-platform/meta/fetch/api/request/request-cache-default.html.ini
+++ b/testing/web-platform/meta/fetch/api/request/request-cache-default.html.ini
@@ -1,2 +1 @@
 prefs: [network.http.rcwn.enabled:false]
-[request-cache-default.html]
diff --git a/testing/web-platform/meta/fetch/api/request/request-cache-force-cache.html.ini b/testing/web-platform/meta/fetch/api/request/request-cache-force-cache.html.ini
index 040f10f2bb38..6498aad1cc12 100644
--- a/testing/web-platform/meta/fetch/api/request/request-cache-force-cache.html.ini
+++ b/testing/web-platform/meta/fetch/api/request/request-cache-force-cache.html.ini
@@ -1,2 +1 @@
 prefs: [network.http.rcwn.enabled:false]
-[request-cache-force-cache.html]
diff --git a/testing/web-platform/meta/fetch/api/request/request-cache-reload.html.ini b/testing/web-platform/meta/fetch/api/request/request-cache-reload.html.ini
index 3bc17e282099..6498aad1cc12 100644
--- a/testing/web-platform/meta/fetch/api/request/request-cache-reload.html.ini
+++ b/testing/web-platform/meta/fetch/api/request/request-cache-reload.html.ini
@@ -1,2 +1 @@
 prefs: [network.http.rcwn.enabled:false]
-[request-cache-reload.html]
diff --git a/testing/web-platform/meta/html/syntax/parsing/html5lib_tests15.html.ini b/testing/web-platform/meta/html/syntax/parsing/html5lib_tests15.html.ini
index f0a32a43d580..050d4306ac64 100644
--- a/testing/web-platform/meta/html/syntax/parsing/html5lib_tests15.html.ini
+++ b/testing/web-platform/meta/html/syntax/parsing/html5lib_tests15.html.ini
@@ -11,7 +11,3 @@
   [html5lib_tests15.html 938af694979b4eae59e7bd3ab71d76e5254192a0]
     expected: FAIL
 
-
-[html5lib_tests15.html?run_type=write]
-
-[html5lib_tests15.html?run_type=uri]
diff --git a/testing/web-platform/meta/intersection-observer/timestamp.html.ini b/testing/web-platform/meta/intersection-observer/timestamp.html.ini
index 224d6e7aa08e..97bd26576858 100644
--- a/testing/web-platform/meta/intersection-observer/timestamp.html.ini
+++ b/testing/web-platform/meta/intersection-observer/timestamp.html.ini
@@ -1,2 +1 @@
 prefs: [privacy.reduceTimerPrecision:false]
-[timestamp.html]
diff --git a/testing/web-platform/meta/mozilla-sync b/testing/web-platform/meta/mozilla-sync
index e654dd99d132..fcbab3436530 100644
--- a/testing/web-platform/meta/mozilla-sync
+++ b/testing/web-platform/meta/mozilla-sync
@@ -1,2 +1,2 @@
-local: ac31e7b4fddc20a83d3675d2ac27672007892a63
-upstream: 232137f0fdacdeed99a7df5dd229d23020b0bccc
+local: de011ba330ecaed7db2db6c6eccb647cf75ddd41
+upstream: 347a7974c93326910109cd0f3386cc427add4ec5
diff --git a/testing/web-platform/meta/navigation-timing/nav2_test_redirect_server.html.ini b/testing/web-platform/meta/navigation-timing/nav2_test_redirect_server.html.ini
index 4f732c2d0bbb..97bd26576858 100644
--- a/testing/web-platform/meta/navigation-timing/nav2_test_redirect_server.html.ini
+++ b/testing/web-platform/meta/navigation-timing/nav2_test_redirect_server.html.ini
@@ -1,2 +1 @@
 prefs: [privacy.reduceTimerPrecision:false]
-[nav2_test_redirect_server.html]
diff --git a/testing/web-platform/meta/requestidlecallback/basic.html.ini b/testing/web-platform/meta/requestidlecallback/basic.html.ini
index 712d4b3ee5d4..97bd26576858 100644
--- a/testing/web-platform/meta/requestidlecallback/basic.html.ini
+++ b/testing/web-platform/meta/requestidlecallback/basic.html.ini
@@ -1,2 +1 @@
 prefs: [privacy.reduceTimerPrecision:false]
-[basic.html]
diff --git a/testing/web-platform/meta/service-workers/service-worker/dedicated-worker-service-worker-interception.https.html.ini b/testing/web-platform/meta/service-workers/service-worker/dedicated-worker-service-worker-interception.https.html.ini
new file mode 100644
index 000000000000..6324c5b9b013
--- /dev/null
+++ b/testing/web-platform/meta/service-workers/service-worker/dedicated-worker-service-worker-interception.https.html.ini
@@ -0,0 +1,8 @@
+[dedicated-worker-service-worker-interception.https.html]
+  expected: ERROR
+  [Static import should be intercepted by a service worker.]
+    expected: TIMEOUT
+
+  [Dynamic import should be intercepted by a service worker.]
+    expected: NOTRUN
+
diff --git a/testing/web-platform/meta/service-workers/service-worker/resource-timing.https.html.ini b/testing/web-platform/meta/service-workers/service-worker/resource-timing.https.html.ini
index 40fafb2415ff..97bd26576858 100644
--- a/testing/web-platform/meta/service-workers/service-worker/resource-timing.https.html.ini
+++ b/testing/web-platform/meta/service-workers/service-worker/resource-timing.https.html.ini
@@ -1,2 +1 @@
 prefs: [privacy.reduceTimerPrecision:false]
-[resource-timing.https.html]
diff --git a/testing/web-platform/meta/url/interfaces.any.js.ini b/testing/web-platform/meta/url/interfaces.any.js.ini
index d0d5686fa01d..879968971ec3 100644
--- a/testing/web-platform/meta/url/interfaces.any.js.ini
+++ b/testing/web-platform/meta/url/interfaces.any.js.ini
@@ -2,5 +2,3 @@
   [URL interface: legacy window alias]
     expected: FAIL
 
-
-[interfaces.any.worker.html]
diff --git a/testing/web-platform/meta/web-animations/animation-model/animation-types/accumulation-per-property.html.ini b/testing/web-platform/meta/web-animations/animation-model/animation-types/accumulation-per-property.html.ini
index 970ee21426d7..67cc89782b57 100644
--- a/testing/web-platform/meta/web-animations/animation-model/animation-types/accumulation-per-property.html.ini
+++ b/testing/web-platform/meta/web-animations/animation-model/animation-types/accumulation-per-property.html.ini
@@ -1,2 +1 @@
 prefs: [layout.css.font-variations.enabled:true, layout.css.overflow-clip-box.enabled:true, layout.css.individual-transform.enabled:true]
-[accumulation-per-property.html]
diff --git a/testing/web-platform/meta/web-animations/animation-model/animation-types/addition-per-property.html.ini b/testing/web-platform/meta/web-animations/animation-model/animation-types/addition-per-property.html.ini
index 81a7de255fe9..67cc89782b57 100644
--- a/testing/web-platform/meta/web-animations/animation-model/animation-types/addition-per-property.html.ini
+++ b/testing/web-platform/meta/web-animations/animation-model/animation-types/addition-per-property.html.ini
@@ -1,2 +1 @@
 prefs: [layout.css.font-variations.enabled:true, layout.css.overflow-clip-box.enabled:true, layout.css.individual-transform.enabled:true]
-[addition-per-property.html]
diff --git a/testing/web-platform/meta/websockets/constructor/014.html.ini b/testing/web-platform/meta/websockets/constructor/014.html.ini
index b511b5cfd064..1ecf2e83b18f 100644
--- a/testing/web-platform/meta/websockets/constructor/014.html.ini
+++ b/testing/web-platform/meta/websockets/constructor/014.html.ini
@@ -2,5 +2,3 @@
   disabled:
     if (os == "win") and (version == "5.1.2600"): https://bugzilla.mozilla.org/show_bug.cgi?id=1090198
     if e10s and debug: https://bugzilla.mozilla.org/show_bug.cgi?id=1090198
-
-[014.html?wss]
diff --git a/testing/web-platform/meta/websockets/cookies/006.html.ini b/testing/web-platform/meta/websockets/cookies/006.html.ini
index 7bee4ae4a26e..aec9965b3387 100644
--- a/testing/web-platform/meta/websockets/cookies/006.html.ini
+++ b/testing/web-platform/meta/websockets/cookies/006.html.ini
@@ -2,5 +2,3 @@
   [WebSockets: setting Secure cookie with document.cookie, checking ws request]
     expected: FAIL
 
-
-[006.html]
diff --git a/testing/web-platform/meta/websockets/unload-a-document/001.html.ini b/testing/web-platform/meta/websockets/unload-a-document/001.html.ini
index 762baf601ce6..03a86d22e1a7 100644
--- a/testing/web-platform/meta/websockets/unload-a-document/001.html.ini
+++ b/testing/web-platform/meta/websockets/unload-a-document/001.html.ini
@@ -1,5 +1,3 @@
 [001.html]
   disabled:
     if (os == "linux") and debug and webrender: https://bugzilla.mozilla.org/show_bug.cgi?id=1372789
-
-[001.html?wss]
diff --git a/testing/web-platform/meta/workers/WorkerPerformanceNow.html.ini b/testing/web-platform/meta/workers/WorkerPerformanceNow.html.ini
index 690f845150d0..97bd26576858 100644
--- a/testing/web-platform/meta/workers/WorkerPerformanceNow.html.ini
+++ b/testing/web-platform/meta/workers/WorkerPerformanceNow.html.ini
@@ -1,2 +1 @@
 prefs: [privacy.reduceTimerPrecision:false]
-[WorkerPerformanceNow.html]
diff --git a/testing/web-platform/meta/workers/semantics/navigation/002.html.ini b/testing/web-platform/meta/workers/semantics/navigation/002.html.ini
index 5530a39d48f2..97bd26576858 100644
--- a/testing/web-platform/meta/workers/semantics/navigation/002.html.ini
+++ b/testing/web-platform/meta/workers/semantics/navigation/002.html.ini
@@ -1,2 +1 @@
 prefs: [privacy.reduceTimerPrecision:false]
-[002.html]
diff --git a/testing/web-platform/meta/xhr/sync-no-progress.any.js.ini b/testing/web-platform/meta/xhr/sync-no-progress.any.js.ini
index d92a0753d6ce..267e0e7c9c72 100644
--- a/testing/web-platform/meta/xhr/sync-no-progress.any.js.ini
+++ b/testing/web-platform/meta/xhr/sync-no-progress.any.js.ini
@@ -2,5 +2,3 @@
   [progress event should not be fired by sync XHR]
     expected: FAIL
 
-
-[sync-no-progress.any.html]
diff --git a/testing/web-platform/tests/service-workers/service-worker/dedicated-worker-service-worker-interception.https.html b/testing/web-platform/tests/service-workers/service-worker/dedicated-worker-service-worker-interception.https.html
new file mode 100644
index 000000000000..2144f4827121
--- /dev/null
+++ b/testing/web-platform/tests/service-workers/service-worker/dedicated-worker-service-worker-interception.https.html
@@ -0,0 +1,40 @@
+<!DOCTYPE html>
+<title>DedicatedWorker: ServiceWorker interception</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="resources/test-helpers.sub.js"></script>
+<script>
+
+// Note that Chrome cannot pass these tests because of https://crbug.com/731599.
+
+function service_worker_interception_test(url, description) {
+  promise_test(async t => {
+    // Register a service worker whose scope includes |url|.
+    const kServiceWorkerScriptURL =
+        'resources/service-worker-interception-service-worker.js';
+    const registration = await service_worker_unregister_and_register(
+        t, kServiceWorkerScriptURL, url);
+    add_result_callback(() => registration.unregister());
+    await wait_for_state(t, registration.installing, 'activated');
+
+    // Start a dedicated worker for |url|. The top-level script request and any
+    // module imports should be intercepted by the service worker.
+    const worker = new Worker(url, { type: 'module' });
+    const msg_event = await new Promise(resolve => worker.onmessage = resolve);
+    assert_equals(msg_event.data, 'LOADED_FROM_SERVICE_WORKER');
+  }, description);
+}
+
+service_worker_interception_test(
+    'resources/service-worker-interception-network-worker.js',
+    'Top-level module loading should be intercepted by a service worker.');
+
+service_worker_interception_test(
+    'resources/service-worker-interception-static-import-worker.js',
+    'Static import should be intercepted by a service worker.');
+
+service_worker_interception_test(
+    'resources/service-worker-interception-dynamic-import-worker.js',
+    'Dynamic import should be intercepted by a service worker.');
+
+</script>
diff --git a/testing/web-platform/tests/service-workers/service-worker/resources/service-worker-interception-dynamic-import-worker.js b/testing/web-platform/tests/service-workers/service-worker/resources/service-worker-interception-dynamic-import-worker.js
new file mode 100644
index 000000000000..680e07ff588c
--- /dev/null
+++ b/testing/web-platform/tests/service-workers/service-worker/resources/service-worker-interception-dynamic-import-worker.js
@@ -0,0 +1 @@
+import('./service-worker-interception-network-worker.js');
diff --git a/testing/web-platform/tests/service-workers/service-worker/resources/service-worker-interception-network-worker.js b/testing/web-platform/tests/service-workers/service-worker/resources/service-worker-interception-network-worker.js
new file mode 100644
index 000000000000..5ff390010134
--- /dev/null
+++ b/testing/web-platform/tests/service-workers/service-worker/resources/service-worker-interception-network-worker.js
@@ -0,0 +1 @@
+postMessage('LOADED_FROM_NETWORK');
diff --git a/testing/web-platform/tests/service-workers/service-worker/resources/service-worker-interception-service-worker.js b/testing/web-platform/tests/service-workers/service-worker/resources/service-worker-interception-service-worker.js
new file mode 100644
index 000000000000..6b43a3769637
--- /dev/null
+++ b/testing/web-platform/tests/service-workers/service-worker/resources/service-worker-interception-service-worker.js
@@ -0,0 +1,9 @@
+const kURL = '/service-worker-interception-network-worker.js';
+const kScript = 'postMessage("LOADED_FROM_SERVICE_WORKER")';
+const kHeaders = [['content-type', 'text/javascript']];
+
+self.addEventListener('fetch', e => {
+  // Serve a generated response for kURL.
+  if (e.request.url.indexOf(kURL) != -1)
+    e.respondWith(new Response(kScript, { headers: kHeaders }));
+});
diff --git a/testing/web-platform/tests/service-workers/service-worker/resources/service-worker-interception-static-import-worker.js b/testing/web-platform/tests/service-workers/service-worker/resources/service-worker-interception-static-import-worker.js
new file mode 100644
index 000000000000..e570958701db
--- /dev/null
+++ b/testing/web-platform/tests/service-workers/service-worker/resources/service-worker-interception-static-import-worker.js
@@ -0,0 +1 @@
+import './service-worker-interception-network-worker.js';
diff --git a/toolkit/components/extensions/Extension.jsm b/toolkit/components/extensions/Extension.jsm
index f33f97f31125..85d26c34d892 100644
--- a/toolkit/components/extensions/Extension.jsm
+++ b/toolkit/components/extensions/Extension.jsm
@@ -1155,7 +1155,9 @@ class BootstrapScope {
   uninstall(data, reason) {
     AsyncShutdown.profileChangeTeardown.addBlocker(
       `Uninstalling add-on: ${data.id}`,
-      Management.emit("uninstall", {id: data.id}));
+      Management.emit("uninstall", {id: data.id}).then(() => {
+        Management.emit("uninstall-complete", {id: data.id});
+      }));
   }
 
   update(data, reason) {
diff --git a/toolkit/components/extensions/ExtensionTestCommon.jsm b/toolkit/components/extensions/ExtensionTestCommon.jsm
index 564a3448f32d..ee2c2d52c6a9 100644
--- a/toolkit/components/extensions/ExtensionTestCommon.jsm
+++ b/toolkit/components/extensions/ExtensionTestCommon.jsm
@@ -56,9 +56,10 @@ XPCOMUtils.defineLazyGetter(this, "console", ExtensionUtils.getConsole);
  * @param {nsIFile} file
  * @param {nsIURI} rootURI
  * @param {string} installType
+ * @param {boolean} [embedded = false]
  */
 class MockExtension {
-  constructor(file, rootURI, installType) {
+  constructor(file, rootURI, installType, embedded) {
     this.id = null;
     this.file = file;
     this.rootURI = rootURI;
@@ -84,6 +85,9 @@ class MockExtension {
     this._extension = null;
     this._extensionPromise = promiseEvent("startup");
     this._readyPromise = promiseEvent("ready");
+    if (!embedded) {
+      this._uninstallPromise = promiseEvent("uninstall-complete");
+    }
   }
 
   maybeSetID(uri, id) {
@@ -374,7 +378,7 @@ var ExtensionTestCommon = class ExtensionTestCommon {
 
     // This may be "temporary" or "permanent".
     if (data.useAddonManager) {
-      return new MockExtension(file, jarURI, data.useAddonManager);
+      return new MockExtension(file, jarURI, data.useAddonManager, data.embedded);
     }
 
     let id;
diff --git a/toolkit/content/aboutNetworking.js b/toolkit/content/aboutNetworking.js
index d81e63e6599e..01e8826bfed5 100644
--- a/toolkit/content/aboutNetworking.js
+++ b/toolkit/content/aboutNetworking.js
@@ -12,6 +12,8 @@ const gDashboard = Cc["@mozilla.org/network/dashboard;1"]
                      .getService(Ci.nsIDashboard);
 const gDirServ = Cc["@mozilla.org/file/directory_service;1"]
                    .getService(Ci.nsIDirectoryServiceProvider);
+const gNetLinkSvc = Cc["@mozilla.org/network/network-link-service;1"]
+                      .getService(Ci.nsINetworkLinkService);
 
 const gRequestNetworkingData = {
   "http": gDashboard.requestHttpConnections,
@@ -127,6 +129,14 @@ function displayWebsockets(data) {
 
 function displayRcwnStats(data) {
   let status = Services.prefs.getBoolPref("network.http.rcwn.enabled");
+  let linkType = gNetLinkSvc.linkType;
+  if (!(linkType == Ci.nsINetworkLinkService.LINK_TYPE_UNKNOWN ||
+        linkType == Ci.nsINetworkLinkService.LINK_TYPE_ETHERNET ||
+        linkType == Ci.nsINetworkLinkService.LINK_TYPE_USB ||
+        linkType == Ci.nsINetworkLinkService.LINK_TYPE_WIFI)) {
+    status = false;
+  }
+
   let cacheWon = data.rcwnCacheWonCount;
   let netWon = data.rcwnNetWonCount;
   let total = data.totalNetworkRequests;