Fantastic, handy little add-on. Sometimes I find NoScript to be a little much, and I set it to allow scripting almost globally, but then I find I must turn JS off at certain sites. This little toolbar button is much easier to use to toggle JS. I also like the graphic, a gear-wheel that is broken when JS is turned off. Much more creative than just a "JS" that changes color or is crossed out when JS is toggled.
Installed in PM 27.4.1 SeaMonkey 2.48, both for Linux. Works great!
Using Firefox 37, at the page http://www.dpreview.com/challenges/Entry.aspx?ID=897600&utm_campaign=internal-link&utm_source=challenges-widget&utm_medium=image&ref=challenges-widget , click on the slideshow button and I could not see anything when you addon was installed, it was simply messing up with this site. When I removed your addon, I could see the slideshow perfectly well!
For this reason alone, it is not possible for me to carry on using your addon.
Ok, now I completely found what I've searched for years. Its the only toolbar button which tracks whether JS settings was changed from elsware, so now Im just simply using enable/disable JS hotkey from keyconfig addon and QuickJS not only shows the current state, I can turn on/of JS from it. I didn't found any bugs so >> 5 stars. Keep it up, man!