[kelnos]

All the web developers I know use and test on Chrome. If they test on Firefox, it's as an afterthought.

[edoceo]

Hello! Know you know one who builds and tests on FF.

[moltar]

I use FF as a daily driver.

[h0l0cube]

I also use it for developing and use its developer tools. If it works on Firefox, there's maybe a few CSS tweaks I need to make when I test on other browsers