As this has become a thread for "share your Firefox tweaks", here are mine:
- uBlock Origin: https://ublockorigin.com/
- Firefox Multi-Account Containers: https://addons.mozilla.org/en-US/firefox/addon/multi-account...
- Sidebery (vertical/tree-style tabs): https://github.com/mbnuqw/sidebery
- and my short userChrome.css file (which primarily removes widgets such as the tab bar that are made redundant by Sidebery): https://gist.github.com/PerpetualCreativity/cfc3ff25acc63db5...
ill add a couple:
yet another speed dial: https://github.com/conceptualspace/yet-another-speed-dial
buster captcha solver: https://github.com/dessant/buster