Bug 1715300 - Enable BFCache in parent. r=smaug

Differential Revision: https://phabricator.services.mozilla.com/D117185

dom/tests/browser/browser_bug1685807.js

@@ -14,7 +14,13 @@ const TEST_URI =
 
 add_task(async function setup() {
   await SpecialPowers.pushPrefEnv({
-    set: [["privacy.window.name.update.enabled", true]],
+    set: [
+      ["privacy.window.name.update.enabled", true],
+      // https://bugzilla.mozilla.org/show_bug.cgi?id=1711544
+      // Disable bfcache for Fission for now.
+      // If Fission is disabled, the pref is no-op.
+      ["fission.bfcacheInParent", false],
+    ],
   });
 });
 

modules/libpref/init/StaticPrefList.yaml

@@ -4022,7 +4022,7 @@
 # If session history is stored in the parent process, enable bfcache for it.
 - name: fission.bfcacheInParent
   type: bool
-  value: false
+  value: true
   mirror: always
   do_not_use_directly: true
 

netwerk/test/browser/browser_post_auth.js

@@ -22,6 +22,15 @@ const FOLDER = getRootDirectory(gTestPath).replace(
   "http://mochi.test:8888/"
 );
 
+add_task(async function setup() {
+  await SpecialPowers.pushPrefEnv({
+    // https://bugzilla.mozilla.org/show_bug.cgi?id=1711676
+    // Disable bfcache for Fission for now.
+    // If Fission is disabled, the pref is no-op.
+    set: [["fission.bfcacheInParent", false]],
+  });
+});
+
 add_task(async function() {
   let tab = await BrowserTestUtils.openNewForegroundTab(
     gBrowser,