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PSA for #VimEverywhere crowd and disgruntled #Pentadactyl and #Vimperator users!
For several years already there is a stable version of VIM-in-firefox which doesn't require #Palemoon.
It's called #Tridactyl and here's its #Github page: https://github.com/tridactyl/tridactyl
(I wrote this toot without touching a mouse, of course)