ff3 seems to be scaling or otherwise doing some manipulation to various images (but not all) before displaying them, and distorting them quite horribly in the process. Several examples from flickr.com attached. (Though the problem isn't unique to this site, this was the one that made me break down and file a bug).
Created attachment 303684 [details] distorted image #1 from http://l.yimg.com/www.flickr.com/images/en-us/video/video_group_promo.png
Created attachment 303685 [details] distorted image #2 from http://l.yimg.com/www.flickr.com/images/flickr_logo_gamma.gif.v35314.14
The strange thing is, if I click 'view image' after right mousing over the corrupt images, firefox displays them perfectly.
View/Zoom/Reset and View/Zoom/Zoom Text Only If it doesn't help you, please reopen. Explanation: Firefox now includes functionality roughly equivalent (or subset of) previously provided by the NoSquit extenstion (https://addons.mozilla.org/en-US/firefox/addon/2592) -- i.e., it remembers per domain the level of zoom you used, in hope that you won't you have to zoom in again and again. NoSquint was one of the most favored extensions for Firefox by many of its users. Apparently default is to zoom images as well as text, which FF doesn't do as well as it could. Conclusion is that I don't see a bug here. If you want to argue with the View/Zoom/Zoom Text Only being unchecked by default, then probably take your case upstream. We suck in representing our users upstream in RFEs.
seriously, as a default, this sucks. So much so, I'm having difficulty holding back just how much. I can't believe this is even remotely a viable default.
Although I totally agree that it is probably a bad default (and I have immediately switch it on) I am afraid I could (after all I used to be a lawyer ;-)) generate legitimate reasons why it was done so. Like for people who are HEAVILY zooming in (e.g., because their eyesight is bad) the page could be severely distorted. Also people could object to the fact that "I wanted my page to zoom in, so I want WHOLE page to zoom in; don't be Microsoft deciding against my will, what's the best for me!" And besides, you underestimate a sad fact that just by being prefering HTML pages full of text to images (which I suspect you do ;-)), you are putting yourself into a tiny minority of fully literate people.