Ask HN: Excluding privacy ones, which Firefox plugins do you use regularly? 6 years ago
Mostly I use two that I build for myself to solve my own problems.
calm closes all inactive tabs: https://addons.mozilla.org/de/firefox/addon/calmdown/
notetab opens a tab to take notes: https://addons.mozilla.org/de/firefox/addon/notetab/
Maybe someone else will find them useful.