Rated 5 out of 5 stars

Great Add-on, the only problem that I have experienced is that the extension toolbar button distorts the height of both Navigation and Bookmarks Toolbar if placed there. My solution is placing it on the Menu bar or leaving it on the Add-on Bar.

This review is for a previous version of the add-on (0.8.1-signed.1-signed). 

It's fixed in version 1.0.1, please update to it :)