- Opens pdfs in my pdf reader right away: https://add0n.com/open-in.html?from=pdf (invert sumatra pdf on windows and you even have a dark mode: "...\SumatraPDF.exe" -bg-color #000000 -set-color-range #FFFFFF #000000 )
- (there is also one to open in chrome, really good if you are using FF but need to use google products like meet or jamboard)
- stylish if you know CSS. I made wikipedia look more like the mobile version, make visited links visible globally, hide jira crap for sprint plannings etc.
- for good keyboard hint navigation: trydactyl (but saka keys is probably more beginner friendly)
I support a bunch of sites right now, but the goal is to make it universal so you can toggle it on and off anywhere (just ajax/endless scroll will be off limits for a while).
If people use it I'll also port to Chrome (still have to tickle what elements on page scroll out of Chrome).
You'd be waiting for chrome?
I also pasted the wrong link I figured. FF is here: https://addons.mozilla.org/en-US/firefox/addon/seen-it-all/