The latest FF builds have been rock solid for me (Win7 x64 with 4 or 5 big name extensions and that's it). I've currently got about 130 tabs open, FF is using ~ 1.1GB of RAM and has been sitting open & running in this state for 3 or 4 weeks with no problems or slow downs whatsoever. The plugin container also finally works reliably so shitty sites with buggy flash code don't take the browser down when flash decides to…
Google has put a lot of time and money into getting Chrome mainstreamed. IE Tab was a big help for enterprise adoption and that made more normal people accept it as a "normal" browser. Most people use Gmail, Google Search, and YouTube, all of which heavily promote Chrome. Firefox has responded well to Chrome for the most part, but when Chrome was released, Fx had some long-standing problems that Chrome obviated, and…
To be fair, extension malware runs rampant in Google Chrome, so it wasn't necessarily a bad idea per se. Just perhaps not a great execution.