I really like this add-on because I can use it on FF57+ and it's compatible with Tree Style Tabs.
I have to say though currently I find myself rarely really using it besides for saving the one session that i have every few minutes.
Main reason for that is the restore behavior. Like someone else already mentioned, when you restore a session it opens a new window and loads every single tab of the session.
Loading as in actually opening and displaying each webpage.
It would be much better to have it open the tabs "unloaded" like when you initially start FF.

Next thing would be a few more options and functionalities.
- Prompt me for a session to load on start.
- Make sessions more like dynamic savestates, so i can overwrite them. E.g. I have a session 'General'. When I load that the manager should "know" that the session is loaded and later when the window is closed or the session saved it should save the changes that were made during the session was loaded into that same session state.
Right now you can only save a new session with same name but different timestamp.
- Give option to only save current window or a selection of windows to a specified session. So one can work with multiple sessions at the same time.
- Give option to load session to current window or open in new window / attach to current session or open as independently loaded session.
- use standard UI font
- introduce groups
- save and restore per tab history

With all of this it would be perfect (and basically a clone of legacy add-on "Session Manager")
I know it's a lot to ask and some things aren't even possible yet due to Mozilla not releasing the needed API.

It does its job.THANK YOU!

Good job, It works very really well.Thank you!!

Right at the time I was looking for a replacement for OneTab this beauty appears. Thank you very much.

yesterday i had a closer look to TSM and got a clue how it works and what features.

i also had tab-saver installed and dismissed it now.

but what i miss is an import export feature like tab-saver. maybe not for separate sessions but for all sessions would be nice.

another point to mention is the UI design - i would prefer it more clear, eg:

1 Window, 1 Tab | Open | Delete
(2017-10-19 11-12-13)
Window1
(fav)(tab)

i had a closer look into and that is possible when positioning the div elements in another formation. ofc the css need a polish to fit again.

translating may be more complicated because many strings are hard coded and some are only notify(e.message);

PS @Jacob - running perfect on b9 and now b10 - new window all stored tabs. try a new profile

4* because import/export ;)

a proudfull replacement for legacy "session manager" - wonderful job.

request: ability to import Session Manager's data, please ;)

bug: i have turned off "save session when window close", but after restart, there is still a "auto saved - windows was closed" session.

1.3.2, firefox 56.

Works really well, but adding an option to automatically restore a session when booting up firefox would be great. I like to keep outlook and slack as pinned tabs that start up with firefox, but get rid of every other tab when I close firefox.

As a very happy long-term Session Manager user, I salute your efforts here! Simple and effective. This should help with our Session Manager withdrawal symptoms.

A few thoughts for further refinement:
1) Logo barely visible on gray ribbon. A multi-color icon would help visibility for diverse color needs. Look too at Firefox's closed window/tab icon; white but outlined in black, thus visible on any background really
2) A third save scheme (daily) would be useful, perhaps at first use each day, i.e. 12:01am or whenever Firefox is next open
3) The list of saved sessions might be easier to digest as single line entries; you might need to abbreviate some data, such as save type (Regular (or Interval), Daily, Closed, and User)

Thanks for launching this!

This extension is really nice! Thanks for making it happen! I'm on FF 57 beta right now and session management is pretty messed up. Without this extension I will lose my tabs every time I restart FF.

I found one problem: this extension would save and reopen private windows as well, which defeats the purpose of a private window. I hope there's a way to filter them out of the save, or at least out of the autosave.

A feature request: Is it possible to add a "remove all" button? Remove them one by one can be a pain at times.

A minimal session manager which does exactly what it advertises. A lifesaver when the Firefox built-in session restore forgets a window or three.

The two (Edit: now only one!) small downsides in my opinion are a) the mentioned missing autosave on exit, or autosaving every 30s but only keeping the newest one, and b) that upon session restore it reloads all tabs - unlike the built-in session restore which loads tabs as inactive or unloaded.

Great Add-on it should be a default option

I wish I had thought of using something like this years ago. Works great on the latest Beta of FF

Finally working session manager on FF57+, THANK YOU!

Works wonderfully in automatic mode with a configurable interval to suit your needs. Supports container state as of ver1.3.2.

Tiniest thing keeping me from 5-staring: Open and Remove are too close together & Remove has no confirmation.

Other than that little thing, I'm as happy as I can be.

Very good!

thank you so much