one of th most important addons for FF!
thank you.
BEST: sync with cloud.

One of my most used extensions. I wish it was available for Firefox on Android.

Great!

Absolutely excellent. Has every feature I need and more, and I never use firefox without it.

Clean and powerful.

If you're losing your previous sessions or you want better tab management, then this extension is exactly for you.

Does what it's suppose to, easy to use.
I'm a programmer so it helps me pick up where I left off, I can quickly load up my last session and have quick access to all my references and save different sessions with different references for different projects I'm working on without having to make loads of bookmarks and open them all manually. Perfect.

Just restored 19 Sidebery tabs in perfect organization after an Alt F4 to the wrong windows! EXCELLENT extension for fixing the tab restoration issue with multiple browser windows open!