Thanks, this works like a charm...would be great if we had an option to remap the gestures though ;-)
Update :
Installed 1.3a1 and remap gestures is working perfectly...I see a bug though, if there is only one tab open, "closing tab" gesture doesn't work in that case...
Otherwise all gestures works, including "new tab"

Also a little request, new tab gesture opens "about:blank" but it would be better if it opens "about:home" instead as this would give direct access to bookmarks at the same time ;-)

Thanks again for this great new addon
ps: do you have an email where we can report bugs and so on?

Update 2:
Just installed 1.4a2, closing tab now works when there only one tab open...also gestures are snappier or it might be a placebo effect ;-)
I saw that you mentioned Quick Gestures in the your addon description yes indeed it was a great addon (used it for years) but it stopped working when Firefox updated to Skia library for content rendering with Firefox v51.0.2... The dev from that addon is gone (last update was in 2014) maybe you should take over where he left off ;-)

Update 3:
Well close tab gesture on only one tab worked fine right after updating the addon to 1.4a2 but it stopped working once again, so still buggy I guess ;-)