I'm having problems with Firefox; it's been telling me "not responding" when I start it up, eventually it gets started but I was having to wait for it for ages, so I tried reinstalling it. The not responding has improved but isn't completely cured, and I am not enjoying this new version! It told me that my Realplayer plugin wasn't compatible with this version, so now I don't get the helpful download option if I hover over a video eg on YouTube. Grr. Also, I get a weird bubble next to my cursor, pretty much when I hover over anything (or nothing!) I previously got the rest of the text if I hovered over a YouTube video title, but now I just get this weird non-helpful bubble thing.
Screenshot:
How can I fix that?