Gotta admit. I've been using Session Manager [1] for years. It's a bit clunky, but it works pretty well once you figure out the UI for saving tab sets. It appears the primary complaints also revolve around its poor UI, but hey, I'm used to it. ;)
It looked very intriguing, and I installed it, but the reviews for the Firefox version are really terrible. Just a heads up in case someone should also install the addon, but not catch the bad reviews.
