I've recently switched from Win to Mac.
Really don't want to lower the addon's raiting or bother you via mail, but this is a big report, in the first place.
When addon is turned on (tried with all other addons disabled), mouse actions start getting weird either from the start or after some time.
Can't put cursor in a particular place in text field. Some buttons won't press in web.
The main functionality of the addon also break (no tab switching, zoom, new tab and so on).
Please, fix it.
I'm sure that it's the plugin issue and not other plugins or app installed on the computer. Maybe it's because Firefox is 64 bit in OS X by default. Don't know exactly.
I'm a long time user of this addon and it's really the main thing of how I interact with firefox.
I can provide any additional info via mail, if needed.