Still currently Firefox is the best option we have, don't we? In terms of compatability and features anyway. For years working as a full-stack developer I stubbornly sticked to Firefox and it has served me well.
Yeah, outside of Chromium forks the only other option is Gecko-based browsers. I use Seamonkey and Palemoon, to avoid the Mozilla Foundation's shenanigans. The performance isn't great, and I have to occasionally restart anything running on the Gecko engine, althogh the latter is also true for Chromium forks.
I work across the stack but necessarily use the browsers end users are working with. Also, I can't pay my fecking credit card on Linux or any browser other than Edge. Whatever tho. A hammer is a hammer.
Not being able to use Firefox for banking or finance is something that hasn't happened to me in years. When it did happen, it was usually fixed with a simple workaround of sending a custom user agent string.
Same. It's exceptionally rare for Firefox to fail me and force me to use a different browser. I'm when it does happen, it's either a Chrome specific feature, or a failure of the developer.