Rated 2 out of 5 stars

trlkly is correct; when the button is activated, it closes the Add-on bar (I have at least 3 other widgets on the bar, and it is still closed).

The notification is not properly sized to the bar (at least not to my bar) ... it is too large. It would be nice to have a whitelist of URLs for which duplication is allowed.

This review is for a previous version of the add-on (0.07.1-signed.1-signed).