Rated 3 out of 5 stars
JSOff used to work fine in Mac Firefox, then disappeared no matter what I did. It took me an hour or two to find out what was going on.
I'm still running Firefox 28 (purposely) in both Mac (Snow Leopard) and in Windows 7. JSOff 1.02 still works fine in Windows 7 FF28, but doesn't show up at all, anywhere, in Mac FF28. The Add-Ons Manager shows it as "installed" and active, but there's no button and no way to access it (even during the toolbar "Customize" routine). I even created a new, blank profile in case there was an extensions conflict; made no difference.
I was luckily able to roll back JSOff to the previous version (1.01) and now it works on my Mac again. I guess the developer never bothered testing version 1.02 in Mac Firefox 28.