Hmm, for me, chrome is a much bigger memory hog than FF. Its memory usage is somewhat more controllable because of the process-tab thing (which is probably also responsible for its greater memory usage), but while actually in use, it uses a lot more memory for a given set of tabs open.

Speedwise, they seem pretty much neck-and-neck, although chrome is faster at some of the advanced webgl 3d rendering stuff...

[The competition with chrome has been a great thing, as it seems to have lit a fire under the FF devs, and resulted in many, many, improvements in recent versions.]

As an end user, i can say that : a) Chrome memory usage is far less than Firefox. try 50+ tab and you'll see. b) Chrome is faster than firefox but it's buggy when you have many tabs c) Mozilla never try to take my personnal data

Actually this is false. Firefox is loads better when it comes to memory. Chrome is slightly faster but not when Firefox has Noscript installed.

Depends on the number of tabs one tends to have open. On Ubuntu your (a) and (b) are far worse for me in Chrome than in Firefox (in fact that much worse that I only use Chrome on my 8GB RAM laptop but not on a 4GB one). I agree with (c).

Have you tried a recent version of firefox? Nicholas Nethercoat and friends have done quite a bit in the last year to reduce memory usage in firefox.

Odd, these days Firefox always uses much less memory than Chrome for me.