As others have said ... Rated 4 out of 5 stars
Thank you! This is a great addition to the FF add-on galaxy! Other users have commented on two irritating behaviors still present in v1.2 that could likely be addressed through an update. If they were, I believe your add-on might become "legendary" in the Firefox Pantheon.
1. A configurable hot-key to toggle the bar on/off.
2. A configurable delay so FF's bottom row can be selected. During the delay, if the left mouse button is pushed the bar would be suppressed.
Also, I would welcome an "on bar" button to access the add-on's options popup.