i use firefox for almost everything(sometimes have to use ie8

) but with the latest versions(after 3.2) the problem has become really impossible to handle
images bigger than 2000x2000(tried images of 8000+x6000+) pixels makes firefox go crazy, eat all the cpu and also uses lots of ram, basically looks like it crashed but no, it is so slow to respond that you have to close the image to recover the web browser and this sometimes can take up to 20 seconds
i was thinking that the problem could be my machine, too slow for such big images, especially when i load 5 or 6 of them but when i test opera, opera can handle them perfectly
i don't know what settings could be responsible of this weird behavior
i only have flashblock addon, videodownloadhelper and flashgot addons installed