Bug 1876056 - Test false-positive buildID mismatch only without forkserver r=jld

Differential Revision: https://phabricator.services.mozilla.com/D199475

browser/base/content/test/tabcrashed/browser_aboutRestartRequired.toml

@@ -10,8 +10,9 @@ prefs = [
 
 ["browser_aboutRestartRequired_basic.js"]
 
-["browser_aboutRestartRequired_buildid_false-positive.js"]
-skip-if = ["win11_2009 && msix && debug"]  # bug 1823581
+# Bug 1876056: re-enable once bug 1877361 is fixed
+#["browser_aboutRestartRequired_buildid_false-positive.js"]
+#skip-if = ["win11_2009 && msix && debug"]  # bug 1823581
 
 ["browser_aboutRestartRequired_buildid_mismatch.js"]
 skip-if = ["win11_2009 && msix && debug"]  # bug 1823581

browser/base/content/test/tabcrashed/browser_aboutRestartRequired_noForkServer.toml

@@ -0,0 +1,14 @@
+[DEFAULT]
+run-if = ["crashreporter"]
+skip-if = ["!debug"]
+
+support-files = ["head.js"]
+prefs = [
+  "dom.ipc.processCount=1",
+  "dom.ipc.processPrelaunch.fission.number=0",
+  "dom.ipc.forkserver.enable=false",
+]
+
+# Bug 1876056: remove once bug 1877361 is fixed
+["browser_aboutRestartRequired_buildid_false-positive.js"]
+skip-if = ["win11_2009 && msix && debug"]  # bug 1823581

browser/base/moz.build

@@ -55,6 +55,7 @@ BROWSER_CHROME_MANIFESTS += [
     "content/test/sync/browser.toml",
     "content/test/tabcrashed/browser.toml",
     "content/test/tabcrashed/browser_aboutRestartRequired.toml",
+    "content/test/tabcrashed/browser_aboutRestartRequired_noForkServer.toml",
     "content/test/tabdialogs/browser.toml",
     "content/test/tabMediaIndicator/browser.toml",
     "content/test/tabPrompts/browser.toml",