Firefox Images Have Shrunk?

[Supersonic]

For the last couple of days my Firefox (2.0.0.7) has been shrinking all the graphics on web pages. For example on NHL.com right now is this...



Which is what it looks like on my Firefox right up to the point where the page finishes loading at which point FF suddenly shrinks it to this...


It does it with every graphic on every web page as far as I can tell, for example the "instant graemlins" or emoticons on 2p2 are tiny.

The only cause I can think of is that I recently used Full Screen Mode on the Ongame poker software and that changed my screen resolution temporarily. It changed back when I closed it and I don't know if the two coincided but this is the only thing I can think of that I have done differently.

There is probably a very simple fix to this, does anyone know what it is? Thanks.

P.S. I hope this is in the right forum as the Software forum seems to be only for poker related software?