+1 my thoughts exactly. It would be so nice if Firefox allowed tridactyl full keyboard control. With qutebrowser, having a proper control mode and an insert mode that work everywhere makes it so much easier to navigate.
I use Firefox every day as a backup, but my primary browser is qutebrowser. I would fully switch in a heartbeat if Firefox allowed full keyboard shortcut configuration. Tridactyl gets pretty close, but the fact that keyboard shortcuts stop working in certain scenarios is a nonstarter for me.
I used to use Firefox on Android but had to stop because of this issue. Too many times filling out a form, grabbing a password from a password manager, and returning to find the form blanked. When it's resolved I'll go back and try again.