I am going to whisper something to you, but don’t tell the author, Andy Mitchell about it: He has planned to release it on Wednesday 23rd at Mozilla.org. I suspect it will be released some time today as I received an email (thanks John!) that the extension is already approved at Firefox Add-ons page. However, the extension installation file at Mozilla Add-ons is corrupted so it will not install for you. Rest assured, Andy has already notified Mozilla on this problem.