No way to sort. GUI requires having to scroll from one side to another to see whether an extension is disabled or not, AND you can click enable/disable until your blue in the ass and it does nothing. Check through Firefox's manager and you can do it while there and whatever extension you wish to enable/disable does not change.

For better readability, perhaps it worth to make on/off buttons of different colors and not so bright.

It also uses a strange way of sorting. Not alphabetical and different from the usual FF extensions list.

Perfect alternative to Extensity (Extension present on chromium based browsers)

Doesn't work at all.