Rated 5 out of 5 stars
genial addon!! it helps a lot especially when you have, like me, an old laptop model eheh.
I tried the beta version too since i'm now using firefox 4 b7 and it works flawlessly! imho it would be better to express the time before automatically unloading any tabs in minutes instead of hours though. But it's still an awesome addon, it should be integrated in the next firefox by all means!