Chrome users seem to use the “bloat” argument against Firefox any chance they get, seemingly without being able to back the claim up with anything of substance. So, these recent benchmarks are rather interesting.
Memory usage under Windows and Mac OS X:
“Under a heavy load of 40 tabs, Safari for Windows uses the least amount of memory (just 725 MB). Firefox comes in second at 910 MB, followed closely by Opera at 925 and Chrome at 995. Microsoft’s own IE9 uses the most memory (1.75 GB).
Opera is the only competitor to use less than a gigabyte of memory in Mac OS X. Safari comes in a close second, eating just over 1 GB, followed by Firefox at 1.25 GB. Chrome reports a whopping 2.3 GB of usage with 40 tabs open, which is significantly more than any other browser.”
Windows 7 and Ubuntu: