Review for UnPlug by Keen101
Rated 5 out of 5 stars
http://keen101.googlepages.com/unplug_firefox3.xpi
here is a version that should work up to ff4. I have not changed anything except the install.rdf file that tells firefox what versions it will work with. So, for anyone who needs unplug for ff3 here it is!
To create your own collections, you must have a Mozilla Add-ons account.