I primarily use Firefox (Nightly), but I have to use Chromium for my school's website because Firefox seems to hate it.
The only time I use Firefox is to test it's capabilites.
Which only happened once because I wanted to see if Firefox was better than Chrome as to if I should start using it instead.
Turns out Chrome won (it's faster and had a 100% on the ACID test while Firefox only had 94%)