Using F9 key (with no option to disable it) is a great disadvantage - I need this key for other operation in application. I had to remove this add-on.

I used this extension with FF for years and would give it 5 stars, but had to switch to another when I updated to WF v56.0.1 64-bit as the icon becomes HUGE. I read the developer fixed this in other versions but it's not quite fixed yet for all Mozilla forks.

Update: 10/5/18 Issue persists. :(

55.0.3 (32-bit) the changes are not saved. At every FF start the addon revert on default settings, including "reload active tab" and "show notifications".