Rated 3 out of 5 stars
A basic feature that should be part of the standard firefox-installation. Unfortunately it did not work in my FF 3.6.3 either, although I just reinstalled FF completely from scratch and installed this as the very first plug-in.
And I am saying this simply because it DOES not work on my FF installation. I don't know why and I wish it would but I am just saying it the way it is. Fortunately though I was able to deinstall it normally again.