diff --git a/seleniumbase/core/browser_launcher.py b/seleniumbase/core/browser_launcher.py
index c2d9ae5b140..eb50a898daf 100644
--- a/seleniumbase/core/browser_launcher.py
+++ b/seleniumbase/core/browser_launcher.py
@@ -2407,8 +2407,6 @@ def _set_firefox_options(
     options.set_preference("dom.webnotifications.enabled", False)
     options.set_preference("dom.disable_beforeunload", True)
     options.set_preference("browser.contentblocking.database.enabled", True)
-    options.set_preference("extensions.allowPrivateBrowsingByDefault", True)
-    options.set_preference("extensions.PrivateBrowsing.notification", False)
     options.set_preference("extensions.systemAddon.update.enabled", False)
     options.set_preference("extensions.update.autoUpdateDefault", False)
     options.set_preference("extensions.update.enabled", False)
diff --git a/seleniumbase/extensions/ReadMe.md b/seleniumbase/extensions/ReadMe.md
index 3b528c91dca..3b93bc7cfe9 100644
--- a/seleniumbase/extensions/ReadMe.md
+++ b/seleniumbase/extensions/ReadMe.md
@@ -9,4 +9,5 @@
 * ad_block.zip => This extension blocks certain types of iframe ads from loading.
 * disable_csp.zip => This extension disables a website's Content-Security-Policy.
 * recorder.zip => Save browser actions to sessionStorage with good CSS selectors.
-* sbase_ext.zip => An extension that does nothing, but helps people learn things.
+* sbase_ext.zip => A Chromium extension that does nothing. (Used for testing purposes)
+* firefox_addon.xpi => A Firefox add-on that does nothing. (Used for testing purposes)
diff --git a/seleniumbase/extensions/firefox_addon.xpi b/seleniumbase/extensions/firefox_addon.xpi
new file mode 100644
index 00000000000..dca8e2e1231
Binary files /dev/null and b/seleniumbase/extensions/firefox_addon.xpi differ