Rated 4 out of 5 stars
Great idea and great addon! Just a suggestion: The button can be a "menu-button" and, I think, the usability will be better...This review is for a previous version of the add-on (1.12.1-signed).
If you mean I should stop hiding the drop marker, that is how version 1.13 will work (not reviewed as of this posting, but you can get it by clicking on Version 1.12 on the bottom of this page in the release notes box.) If not, please post on http://forums.mozillazine.org/viewtopic.php?f=48&t=2141579 so I can get more info.