Broke in Firefox 29 Rated 5 out of 5 stars
An amazing and very useful add-on, but Firefox 29 broke it.
In addition to removing the add-on bar, forcing QuickJava to clutter the single control bar instead of sitting unobstructingly in its rightful place, it also made it not work at all:
All options now appear disabled all the time, and won't change when clicked.
"Refresh icons" doesn't work.
Edit: Enabling/disabling images does seem to work when one refreshes the page, though there is no feedback at all on the icon itself. It never updates, not even with "Refresh icons", and that applies both to the toolbar and to the horrendous new Firefox menu.
Edit2: And now after rebooting Firefox, it appears to work.
Strange, I've been using it in FF29 for weeks now without issues and other users have also been using it. I'm not sure what fixed it but at least it is working for you now. Please note that the review section is not valid for bug reports, please use the github repository from the website for issues reporting/tracking.