Excellent.

Removes the burden of a long-running browser: it's always as if started anew, regardless of how many tabs you have. Only the few recently-visited tabs are loaded and running, and all of the others got unloaded (just like a freshly started browser would have them). Really nice for machines without a ton of free RAM.

Useful, simple to use, high performance gain, and open-source. Highly recommended!

Environmental friendly addon

Love it, one of my must have add-ons.

Not actually that useful. Storing Tabs in RAM may be faster on your Machine.

It depends on your bottleneck, do you have 4GB of RAM, use that Addon.

Do you have a slow Wifi card and processor, dont use it, as sites reload more often.

Really useful extension, nothing to really complain about.
Simple, Light, Effective! I use it all the time

halved FF memory usage.