diff --git a/tests/wpt/metadata/FileAPI/url/url-with-fetch.any.js.ini b/tests/wpt/metadata/FileAPI/url/url-with-fetch.any.js.ini
index 4c1aa18e695..abf0d50aff3 100644
--- a/tests/wpt/metadata/FileAPI/url/url-with-fetch.any.js.ini
+++ b/tests/wpt/metadata/FileAPI/url/url-with-fetch.any.js.ini
@@ -2,9 +2,6 @@
   [Revoke blob URL after creating Request, will fetch]
     expected: FAIL
 
-  [Revoke blob URL after calling fetch, fetch should succeed]
-    expected: FAIL
-
 
 [url-with-fetch.any.html]
   [Revoke blob URL after creating Request, will fetch]
diff --git a/tests/wpt/metadata/MANIFEST.json b/tests/wpt/metadata/MANIFEST.json
index 54d0ebbc3ff..39991835803 100644
--- a/tests/wpt/metadata/MANIFEST.json
+++ b/tests/wpt/metadata/MANIFEST.json
@@ -715658,7 +715658,7 @@
    "support"
   ],
   "tools/wptrunner/wptrunner/browsers/firefox.py": [
-   "0f8075337813783c76e4be4dec9cc931a4252c41",
+   "b6ee0f4998e9a2189cfca99b3cce1a6b11ea858c",
    "support"
   ],
   "tools/wptrunner/wptrunner/browsers/firefox_android.py": [
@@ -716050,7 +716050,7 @@
    "support"
   ],
   "tools/wptrunner/wptrunner/wpttest.py": [
-   "4cbaedcdb0163776dfcf55d13afca4cdba05dc92",
+   "d650e98dfbf5976afa0138f0ac166e950e194e82",
    "support"
   ],
   "tools/wptserve/.gitignore": [
diff --git a/tests/wpt/metadata/css/cssom-view/MediaQueryList-addListener-removeListener.html.ini b/tests/wpt/metadata/css/cssom-view/MediaQueryList-addListener-removeListener.html.ini
index c884dc82eab..628b1fab770 100644
--- a/tests/wpt/metadata/css/cssom-view/MediaQueryList-addListener-removeListener.html.ini
+++ b/tests/wpt/metadata/css/cssom-view/MediaQueryList-addListener-removeListener.html.ini
@@ -2,6 +2,3 @@
   [listeners are called when <iframe> is resized]
     expected: FAIL
 
-  [listeners are called correct number of times]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata/fetch/content-type/response.window.js.ini b/tests/wpt/metadata/fetch/content-type/response.window.js.ini
index a46dd474941..5db729456de 100644
--- a/tests/wpt/metadata/fetch/content-type/response.window.js.ini
+++ b/tests/wpt/metadata/fetch/content-type/response.window.js.ini
@@ -312,12 +312,15 @@
   [<iframe>: combined response Content-Type: text/html;x=" text/plain]
     expected: FAIL
 
-  [<iframe>: combined response Content-Type: text/html;" text/plain]
-    expected: FAIL
-
-  [<iframe>: combined response Content-Type: text/html */*;charset=gbk]
-    expected: FAIL
-
   [<iframe>: separate response Content-Type: text/html;x=" text/plain]
     expected: FAIL
 
+  [<iframe>: combined response Content-Type: text/html */*]
+    expected: FAIL
+
+  [<iframe>: combined response Content-Type: text/html;" \\" text/plain]
+    expected: FAIL
+
+  [<iframe>: separate response Content-Type: text/html;" \\" text/plain]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/fetch/content-type/script.window.js.ini b/tests/wpt/metadata/fetch/content-type/script.window.js.ini
index d2df9b78483..2d5faa72ac7 100644
--- a/tests/wpt/metadata/fetch/content-type/script.window.js.ini
+++ b/tests/wpt/metadata/fetch/content-type/script.window.js.ini
@@ -53,6 +53,6 @@
   [combined text/javascript ]
     expected: FAIL
 
-  [separate text/javascript x/x]
+  [separate text/javascript;charset=windows-1252 error text/javascript]
     expected: FAIL
 
diff --git a/tests/wpt/metadata/fetch/nosniff/parsing-nosniff.window.js.ini b/tests/wpt/metadata/fetch/nosniff/parsing-nosniff.window.js.ini
index ce73518c20a..b7052af5b5c 100644
--- a/tests/wpt/metadata/fetch/nosniff/parsing-nosniff.window.js.ini
+++ b/tests/wpt/metadata/fetch/nosniff/parsing-nosniff.window.js.ini
@@ -11,9 +11,6 @@
   [X-Content-Type-Options%3A%20nosniff%0C]
     expected: FAIL
 
-  [X-Content-Type-Options%3A%20'NosniFF']
-    expected: FAIL
-
-  [X-Content-Type-Options%3A%20%2Cnosniff]
+  [X-Content-Type-Options%3A%0D%0AX-Content-Type-Options%3A%20nosniff]
     expected: FAIL
 
diff --git a/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_3.html.ini b/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_3.html.ini
new file mode 100644
index 00000000000..51f8272a6de
--- /dev/null
+++ b/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_3.html.ini
@@ -0,0 +1,4 @@
+[traverse_the_history_3.html]
+  [Multiple history traversals, last would be aborted]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/html/interaction/focus/the-autofocus-attribute/skip-document-with-fragment.html.ini b/tests/wpt/metadata/html/interaction/focus/the-autofocus-attribute/skip-document-with-fragment.html.ini
index c12c0f8ae48..6852d7663de 100644
--- a/tests/wpt/metadata/html/interaction/focus/the-autofocus-attribute/skip-document-with-fragment.html.ini
+++ b/tests/wpt/metadata/html/interaction/focus/the-autofocus-attribute/skip-document-with-fragment.html.ini
@@ -1,4 +1,8 @@
 [skip-document-with-fragment.html]
+  expected: TIMEOUT
   [Autofocus elements in iframed documents with URL fragments should be skipped.]
     expected: FAIL
 
+  [Autofocus elements in top-level browsing context's documents with URI fragments should be skipped.]
+    expected: TIMEOUT
+
diff --git a/tests/wpt/metadata/html/semantics/scripting-1/the-script-element/execution-timing/077.html.ini b/tests/wpt/metadata/html/semantics/scripting-1/the-script-element/execution-timing/077.html.ini
new file mode 100644
index 00000000000..bcd2fd0eab8
--- /dev/null
+++ b/tests/wpt/metadata/html/semantics/scripting-1/the-script-element/execution-timing/077.html.ini
@@ -0,0 +1,4 @@
+[077.html]
+  [ adding several types of scripts through the DOM and removing some of them confuses scheduler ]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/performance-timeline/webtiming-resolution.any.js.ini b/tests/wpt/metadata/performance-timeline/webtiming-resolution.any.js.ini
index 6d08beab111..97f8a0cc51f 100644
--- a/tests/wpt/metadata/performance-timeline/webtiming-resolution.any.js.ini
+++ b/tests/wpt/metadata/performance-timeline/webtiming-resolution.any.js.ini
@@ -10,3 +10,6 @@
   [Verifies the resolution of entry.startTime is at least 20 microseconds.]
     expected: TIMEOUT
 
+  [Verifies the resolution of performance.now() is at least 5 microseconds.]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/workers/constructors/Worker/Worker-constructor.html.ini b/tests/wpt/metadata/workers/constructors/Worker/Worker-constructor.html.ini
new file mode 100644
index 00000000000..80f9a4f15b8
--- /dev/null
+++ b/tests/wpt/metadata/workers/constructors/Worker/Worker-constructor.html.ini
@@ -0,0 +1,2 @@
+[Worker-constructor.html]
+  expected: ERROR
diff --git a/tests/wpt/metadata/workers/semantics/multiple-workers/005.html.ini b/tests/wpt/metadata/workers/semantics/multiple-workers/005.html.ini
index f584fce5df1..268949ced5c 100644
--- a/tests/wpt/metadata/workers/semantics/multiple-workers/005.html.ini
+++ b/tests/wpt/metadata/workers/semantics/multiple-workers/005.html.ini
@@ -1,5 +1,4 @@
 [005.html]
-  expected: ERROR
   [dedicated worker in shared worker in dedicated worker]
     expected: FAIL
 
diff --git a/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/browsers/firefox.py b/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/browsers/firefox.py
index 0f807533781..b6ee0f4998e 100644
--- a/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/browsers/firefox.py
+++ b/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/browsers/firefox.py
@@ -168,17 +168,13 @@ def run_info_extras(**kwargs):
           "wasm": kwargs.get("wasm", True),
           "verify": kwargs["verify"],
           "headless": kwargs.get("headless", False) or "MOZ_HEADLESS" in os.environ,
+          "sw-e10s": True,
           "fission": get_bool_pref("fission.autostart")}
 
     # The value of `sw-e10s` defaults to whether the "parent_intercept"
     # implementation is enabled for the current build. This value, however,
     # can be overridden by explicitly setting the pref with the `--setpref` CLI
-    # flag, which is checked here. If not supplied, the default value of
-    # `sw-e10s` will be filled in in `RunInfo`'s constructor.
-    #
-    # We can't capture the default value right now because (currently), it
-    # defaults to the value of `nightly_build`, which isn't known until
-    # `RunInfo`'s constructor.
+    # flag, which is checked here.
     sw_e10s_override = get_bool_pref_if_exists("dom.serviceWorkers.parent_intercept")
     if sw_e10s_override is not None:
         rv["sw-e10s"] = sw_e10s_override
diff --git a/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/wpttest.py b/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/wpttest.py
index 4cbaedcdb01..d650e98dfbf 100644
--- a/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/wpttest.py
+++ b/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/wpttest.py
@@ -119,18 +119,6 @@ class RunInfo(dict):
         if extras is not None:
             self.update(extras)
 
-        # Until the test harness can understand default pref values,
-        # (https://bugzilla.mozilla.org/show_bug.cgi?id=1577912) this value
-        # should by synchronized with the default pref value indicated in
-        # StaticPrefList.yaml.
-        #
-        # Currently for automation, the pref (and `sw-e10s`) defaults to true in
-        # nightly builds and false otherwise but can be overridden with
-        # `--setpref`. If overridden, the value would be initialized in
-        # `run_info_extras` and be supplied in the `extras` parameter.
-        if "sw-e10s" not in self:
-            self["sw-e10s"] = self.get("nightly_build", False)
-
         self["headless"] = extras.get("headless", False)
         self["webrender"] = enable_webrender