I too am a Chrome convert and loved FireFox in its day (mainly because of its development tools), but its rampant memory leaks drove me away. While Chrome's dev tools aren't quite as robust as FireFox's, they're getting there very very quickly.
On a side note, I'm tired of having to design and develop around IE. All versions have the promise of adhering to modern web standards, but with each release, they tend to fall short of those promises.
What's lacking in Chrome's dev tools compared to Firefox? Are we talking native dev tools, or including Firebug and etc in the Firefox camp. Its been my experience that all these valuable extensions get performance hits more and more as Firefox has begun to frown lately, further adding to the decline in quality UX.
The fact that Chrome developer tools are built-in and seamlessly integrated is what makes it my primary.
Back when I used Windows, the memory leaks in Firefox were one of the main reasons I switched to Chrome on the day it came out and never looked back.
I'm not sure if that's still a problem, or if that's a problem on other platforms, but now I use Chromium on Linux and I've never had any major issues. (Except sometimes when Flash is involved, but this is Hacker News).
On a side note, I'm tired of having to design and develop around IE. All versions have the promise of adhering to modern web standards, but with each release, they tend to fall short of those promises.