I have patched the popular addon Screen Capture Elite! UPDATES FOR VERSION 6.0 firefox!!!
It is an excellent screen capture addon that is the most low profile capturing one yet.
You can save screenshots with one click and they are named very well.
Here are the download links: MediaFire/4Shared
here's the addon-patched to firefox 9.0
open firefox and go to addons> "install add-on from file" find modified .xpi>enjoy.