diff --git a/browser_patches/firefox-beta/BUILD_NUMBER b/browser_patches/firefox-beta/BUILD_NUMBER
index e8eaba0037..3acd579288 100644
--- a/browser_patches/firefox-beta/BUILD_NUMBER
+++ b/browser_patches/firefox-beta/BUILD_NUMBER
@@ -1,2 +1,2 @@
-1332
-Changed: lushnikov@chromium.org Thu Jun 30 02:06:47 MSK 2022
+1333
+Changed: dgozman@gmail.com Thu Jun 30 14:19:05 PDT 2022
diff --git a/browser_patches/firefox-beta/preferences/playwright.cfg b/browser_patches/firefox-beta/preferences/playwright.cfg
index c5bc70e0ff..e55d07a4f4 100644
--- a/browser_patches/firefox-beta/preferences/playwright.cfg
+++ b/browser_patches/firefox-beta/preferences/playwright.cfg
@@ -16,9 +16,12 @@ pref("browser.tabs.remote.separatePrivilegedMozillaWebContentProcess", false);
 
 pref("pdfjs.disabled", true);
 
+// Disable all kinds of cross-process navigations until we are ready.
 pref("fission.autostart", false);
 pref("fission.webContentIsolationStrategy", 0);
 pref("fission.bfcacheInParent", false);
+// Avoid about:blank loading cross-process until we are ready.
+pref("browser.tabs.remote.systemTriggeredAboutBlankAnywhere", true);
 
 // =================================================================
 // =================================================================
diff --git a/browser_patches/firefox/BUILD_NUMBER b/browser_patches/firefox/BUILD_NUMBER
index 76efacde24..fd88fdec5e 100644
--- a/browser_patches/firefox/BUILD_NUMBER
+++ b/browser_patches/firefox/BUILD_NUMBER
@@ -1,2 +1,2 @@
-1331
-Changed: lushnikov@chromium.org Thu Jun 30 02:09:30 MSK 2022
+1332
+Changed: dgozman@gmail.com Thu Jun 30 14:19:05 PDT 2022
diff --git a/browser_patches/firefox/preferences/playwright.cfg b/browser_patches/firefox/preferences/playwright.cfg
index c5bc70e0ff..e55d07a4f4 100644
--- a/browser_patches/firefox/preferences/playwright.cfg
+++ b/browser_patches/firefox/preferences/playwright.cfg
@@ -16,9 +16,12 @@ pref("browser.tabs.remote.separatePrivilegedMozillaWebContentProcess", false);
 
 pref("pdfjs.disabled", true);
 
+// Disable all kinds of cross-process navigations until we are ready.
 pref("fission.autostart", false);
 pref("fission.webContentIsolationStrategy", 0);
 pref("fission.bfcacheInParent", false);
+// Avoid about:blank loading cross-process until we are ready.
+pref("browser.tabs.remote.systemTriggeredAboutBlankAnywhere", true);
 
 // =================================================================
 // =================================================================