I've been doing web development for almost 20 years now and I've used Firefox as my primary browser since it was Phoenix and before that I used the Mozilla Comm

I've been doing web development for almost 20 years now and I've used Firefox as my primary browser since it was Phoenix and before that I used the Mozilla Communicator Suite and Navigator. I may not be rolling the latest features like WebSockets but I very rarely come across incompatibilities anymore. IE remains the biggest issue and honestly a lot of those are removing hacks and workarounds on older sites as after about IE9 they started to catch up with support. Most of the "incompatibilites" that I fix are actually when our Junior Devs are using CSS attributes incorrectly and they've hacked their code until Chrome mostly works. In this era of Bootstrap it's not uncommon for developers to just throw CSS at the problem and 99% of the time that's what's caused the issue in the first place.