I think I had something similar, best thing to do is save out any data you keep and do a clean re-install
Forum Response - Clean reinstall | Firefox Help
maybe worth a try.
Hahaha yeah it was a rather odd site to click.
I was also having dramas viewing inbedded video clips, I did what you said and almost everything was out of date, for some reason only Adobe was auto updating. Why the hell is Quicktime 40MB, it does nothing?!
EDIT- still the same, wonder what I've done?
DOUBLE EDIT, I have disabled all add ons and it is still the same, it works fine in Opera.
Nope, still the same, no idea what is going on.
Tried all that just then, deleted the files mentioned, still the same problem, wonder why it works fine going bottom to top?
I only have FF and Opera and Opera works fine but I Hate it.
I also have a slight drama with my Bluetooth, it doesn't work 100% and the only driver that seems to work for my computer is one made for Vista 64bit and I can only receive data, grrrrrr computers!
yeah Opera's good for fast web browsing but if you wan to do any work with it it's rubbish, great for mobiles.
Just uninstall FF and re-install. I think if you download latest version - probably start the download straight away: Mozilla Download
and it will check to see if it's the latest and if not it should uninstall old and install itself.