Does not work at all on Mac OS 10.9.5

Hey, please read the description:
> For MacOS & Linux users: Use left or middle mouse button due to the different right click/context menu behaviour (see this bug ( https://bugzilla.mozilla.org/show_bug.cgi?id=1360278 ))

I DID try left, right and middle scroll wheel. DOES NOT WORK. Had to revert back to FF 56 and use Fire Gestures.

UPDATE - literally ten minutes later the add-one started to work!!!! But works intermittently. Not reliable

UPDATE - Works 100% now. One thing missing. Restore window size! After maximizing window, I often want to restore it to previous size. At present can only maximize or minimize. FEATURE REQUEST! Do this and I'll give 5 stars! Thanks for being responsive