Seems working perfectly..
I use it to refresh my page after Userstyles / CSS test.

Report:
When i open its options with the Addon "Extension Options Menu" (https://addons.mozilla.org/en-US/firefox/addon/extension-options-menu/)
, it provide a popup (and don't go to the official Option page ).
And if i change something in this popup , it don't remember my choice.

With the legal options page it's OK.