After some trial and error, I decided to clear out the cache and history in Firefox, hoping it would do the trick. And you know what? It actually seemed to work! No more alerts popping up every time I opened my browser. It was like a breath of fresh air.
But hey, if you're still dealing with those pesky alerts, maybe give a malware analysis VM a shot. I've heard they can be pretty handy in situations like this, helping to pinpoint any underlying issues causing the trouble.