Firefox Support Forum

Ok-So this popup window popped up when I returned to Firefox. I don't think it's legit and I am wondering how I go about blocking it permanently. I searched the settings but didn't see where I could post the URL so that is why I am posting this here.

I copied the URL but I don't want to post it here in case it could do something to someone else's system. But here is the screenshot. Please advise me what I need to do. Thank you! TGIF!

I am on a Mac running Sonoma.

I deleted the old user names and passwords associated with my bank account. Now I can no longer login to my bank acct using Firefox. Only with another browser.

I tried to uninstall then reinstall Firefox but the problem continues. What to do now to login to my bank account?