the only time i notice FF being slower than chrome is on startup where it takes a couple of seconds longer. thankfully, I'm quite able to wait 2 seconds without going crazy.
i just don't like the chrome interface or the lack of options and customisation. it is very much bare bones. additionally it does all these aggressive preloads in the background unless you tell it not to and it is useless for adblocking etc. it most definetly tracks far more personal information than any other browser too and if you don't know what you are doing, the cache folder can grow to gigantic proportions.
as for memory usage i don't see this as a problem. my FF never uses much more than a few hundred megs even with tons of stuff open. this might have been a problem when everyone had 512megs total system ram but not now. i mean, seriously, you guys probably have several gigabytes of ram available at any one time - what is the problem here?