The button is gone forever Rated 2 out of 5 stars

The icon/button as shown in the "preview" was there on my toolbar for several weeks (I know since I did use it). Now the button it's gone. Vanished. Can't find it to re-customize toolbar, either. I re-installed. Re-started FF. Nothing. No change.
Please fix it!

This review is for a previous version of the add-on (0.7).