I had been reluctantly considering giving up using Firefox as it crawled to a halt so often on so many sites. To be fair I think it is because I keep lots of tabs open and Firefox did not seem to deal will with pages with many refreshing elements … many air and train ticketing sites were particular problems. However, Firefox 3 has been running continuously for some time now and looking at ‘top’ in terminal window has about 1/3 the real memory footprint compared with Firefox 2 … now it is comparable with Word, Dreamweaver, etc. … I had been sticking with Firefox largely because the Firefox Snip!t bookmarklet works better than the Safari one, so now I can continue to do so without the machine crawling to a halt – well done team Mozilla 🙂