It's good. Works almost like The Great Suspender for Chrom(e/ium).

Amazing add-on! Lots of options to customize it to your liking as well.

Literally saved my laptop. Now I can continue hoarding tabs like I usually do without the laptop slowing down to the point where it would take forever to do anything :D

Update request: Ability to whitelist domains to never suspend. I like that I can not suspend pinned tabs, but I only pin a few tabs regularly and forget on others that may need to stay active.

Love this Extension. I like to keep tabs open as I switch between many tasks throughout the day, and keeping the tab open reminds me what I haven't finished yet! The company wont give me more RAM, so this is a great solution to the performance issue having 25 tabs open can cause!

how i can enable favicons, with this small image much easy to navigate tabs, if i cant do this, add this in new version please :)

This is a must-have for Firefox.

Simple, effective, reliable. Does one thing well, just like tigers like it.

Memory saving, Life saving!!!
I use lots of tabs, due to the excellent TreeStyleTab, so Firefox easily eats 3GB of memory. With this extension I get usages of 1 to 1.5 GB, without any noticeable loss of performance.