How did firefox get development stagnate so badly? We have more workarounds and polyfills for dealing with firefox than we do for dealing with IE now, it is ridiculous.
What exactly are you talking about?
It's hard to believe you have to tell users to use IE over Firefox because of that difference.
Firefox doesn't support advanced (and more user friendly) input types. Number, color, date/time.
At least that's what I'm guessing.
If you have a pet bug that badly needs fixing, though, I can help you get started, if you are interested.
Here are some open bugs which affect sites I work on, one which was opened in 2000. I don't understand how having a bug open for 13 years is acceptable.
https://bugzilla.mozilla.org/show_bug.cgi?id=63895