Rated 5 out of 5 stars
It was one of best extensions for Firefox. Then, when Mozilla decided to kill exensions with Firefox v57+, some users didn't undestand it was Mozilla decision to kill all valuable plugins and replace them with crappy Chrome-wannabe API.
Dear Users, Learn why Firefox 57+ (Quantum etc.) sucks, then complain about plugins not working.
PS. Wanna have real browser with extensions support? Use PaleMoon or SeaMonkey forks from old Mozilla Firefox. Those browsers can still use real extensions, not the crippled versions.