Haven't tested yet, but finally found an extension that's almost replacement for the official Mozilla extension Session Manager, which didn't get a version for new extensions when legacy extension support was removed.

Only thing I'd love to have is the option to replace Firefox session restore with this so that when starting Firefox, it would open Tab Session Manager as popup - like Session Manager. You could there pick a session, AND unselect tabs if you wanted to leave some of them out. It also gave option to just start fresh, but of course you could load a session later. This is what I'd love to get when the browser starts, no loading previous session at startup but instead asking for one before opening browser windows (or maybe opening one empty browser window, then either loading selected session on that and new windows (if the session is multi-window).

Also LOVE that it supports Tree Style Tabs!!!

Works well, just wish it supported backing up to free services like Nextcloud and Internxt.

All if fine by my taste but....where are backup files stored in google drive ????
I see that sync works but... when i delete some sesions then clicking sync and all sesions come's back :/

was able to save and load a session, but since i use tree style tab - the hierarchy of the tabs was lost. thankfully, the vertical order was preserved, so only the 'groupings' were lost.

honestly, it was not a big deal at all. (took less than a minute to put them back into groups manually for quite a few tabs)

i don't honestly expect a third party extension to play nice with every other third party extension - that would be crazy. as far as i'm concerned, this extension did exactly what it said it would do.

nice Session Buddy alternative

very nice and simple ! if I may : a drag and drop feature between session would be even nicer !

It was best extension after Session manager, but now its behavior is strange. It does not save more than 50 session and when you try save new one one of others disappear.

is missing to encrypting session data with key3.db( in may case i use master password in firefox) or and option to encryptiing sessions

thanks a lot!

Very useful. It would be quite a bit easier to use if there was a "Help / Use" section.