Rated 5 out of 5 stars
I was using All-in-One Gestures for years, but since FF43+ it doesn't work anymore, especially the feature I'm using most frequently: closing the current tab (NOT "document", mind you. Tab).
Closing the current document is no alternative, because then FF is closed when the last tab is closed, which I don't want at all (and which BTW also breaks the options of Tab Mix Plus and Configuration Mania to *not* close FF after the last tab has been closed).
So, kudos to the author of Miouse Gestures Suite for providing the perfect substitute/successor for a once great add-on.