How about add features:
> Add to current tab to session group.
> Override session group with current window tabs.
> Always show searchbar.
> Order group by drag.
> Provide recycling bins.

saved my a*s off

Great add-on, just what I needed. Many thanks!

>>> "IndexedDB" ERROR MESSAGE ON NEW INSTALL!!! RESTART THE BROWSER TO FIX!!! <<<
#. IMPRESSIVE SESSION MANAGER - AFTER RE-OPENING, HAD ALREADY A SAVED SESSION (NOT CURRENT) FROM 8 HOURS AGO WHEN I PREVIOUSLY OPENED BROWSER!
VERY COOL!!! :D ;) ;D :P :B

Greate addon. Let's add "recomended" badget?

Génial ! A tout récupéré après un vilain crash.

I use it approx 3 years! The Best!

WARNING: this addon is not compatible with «Simple Tab Groups» and would pull all grouped tabs into one window. Luckily, STG has a backup function.

Firefox can be garbage with saving your sessions. Can't count how many times it has failed for no damn reason, and this add-on has saved me countless headache. Definitely a must have

同期機能搭載で更に便利になった

Great addon, has been updated to issue features/fixes addressed to be lacking in the previous reviews.
Seemingly the most modern and useful session manager.