@first-look: good. ;-)

This should be a native part of the browser.

It doesn't work on some tabs, e.g. extension tabs which I'm using a lot. But there's no way for dev to work around that, its FF limitation, so 5 stars anyway.

Conflict with addon "zoom image": cannot disable settings "else" mouse right-click and left-click

all of a sudden it doesn't work on all the sites

So far, the best gesture extension I've found, and I've tried quite a few not only in Firefox, but also in Chrome/ Vivaldi. Works smoothly and I haven't found bugs.

On linux, a lot of extensions just cant avoid triggering the right click menu. Gesturefy is the best looking and the most reliable. Been using for years. Tried some other extensions, tried other browsers, but I'm always back to firefox with gesturify! Don't forget to backup your config.