Very nice addon, unfortunately limited because of Firefox politics.

Does its job even with Beta Fx (v57 b11....)

The "extra" feature I suggest is : a way to pin (save and block) the settings chosen for a site. so that no accidental change can occur ... and so that the shortcut "ctrl+0" brings back the "fixed" if changes were made to a site setting.

Thanks anyway for the intelligence your addon adds to Firefox