Button icon for toolbar now Gone Rated 3 out of 5 stars

The icon/button as shown in the "preview" was there on my toolbar two days ago (I know since I did use it). Now two days later it is gone. Vanished. Can't find it to re-customize toolbar, either. I re-installed. Re-started FF. Nothing. No change.

Where did it go?!?

This review is for a previous version of the add-on (0.7.1-signed.1-signed).