This is the first comment I've read so far that I 100% agree with.
I personally see no reason to keep more than 8-10 tabs open at a given time which doesn't affect my CPU performance whatsoever (running a "standard" dev machine of 12GB+ RAM, i7, etc) so I could care less if FF handles 40 tabs better.
And quickly, some reasons I love Chrome (& Google):
- Accessible nightly builds (Canary)
- AngularJS debug extension
- Built-in bookmark/history/search sync (read something at home yesterday - can easily find it in my history at work or on mobile)