Update Firefox preferences

Author: mdmintz

seleniumbase/core/browser_launcher.py

@@ -175,6 +175,10 @@ def _create_firefox_profile(
     profile.set_preference("extensions.update.enabled", False)
     profile.set_preference("browser.privatebrowsing.autostart", True)
     profile.set_preference("extensions.allowPrivateBrowsingByDefault", True)
+    profile.set_preference("extensions.PrivateBrowsing.notification", False)
+    profile.set_preference("extensions.systemAddon.update.enabled", False)
+    profile.set_preference("extensions.update.autoUpdateDefault", False)
+    profile.set_preference("extensions.update.enabled", False)
     profile.set_preference("devtools.errorconsole.enabled", True)
     profile.set_preference(
         "datareporting.healthreport.logging.consoleEnabled", False)