Recently Firefox started acting up when attempting to display some images.
It would work fine with thumbnails for example but clicking on them to get the full picture gave me a message saying that the image couldn’t be displayed as it contain errors. After checking numerous sites and getting the same image, I tried a windows machine with IE, and they appeared fine.
First thing to do is run Firefox in safe mode. If you’re using a windows machine, simply pull up a command line box (Start, Run), and type firefox -safe-mode in it.
That will run Firefox with everything disabled. I did that, and images worked fine. Next step is to go back to regular firefox, and disable all your add-ons. Then re-activate them, one by one, until you recreate the error.
In my case, it was my Skype Extension add-on that was causing the issue. That add-on highlights phone numbers within a web page allowing you to dial them by clicking on them, if you use Skype and SkypeOut (which I do).
I guess, I’ll have to wait for a further update, or work around, to get that facility back. I don’t use it a lot (I don’t use the phone a lot really, as I much prefer email), but it can be useful at times.