Breaks tabs... Rated 1 out of 5 stars

I just installed this on FF 18.0 and strangely it broke/prevented tab switching. The description is exactly what I was looking for... but it has some severe bugs to be worked out, at least for FF version 18. Based on some of the other reviews here, it sounds like this was working on early FF versions and I'd be willing to give it another try if an update was applied at some point. I'm still left wondering why it was available on the FF site if it doesn't work on my current version.