Doesn't save a session automatically. More over it creates blank tabs every time I restore the session.

Update: Firefox 70 and above is crap, does not load many tabs, the problem is not related to MySessions:
https://www.bleepingcomputer.com/news/software/mozilla-provides-workaround-for-firefox-70-not-loading-sites/
I would give this 3 stars (for decent operation, after all it is one of the few workable solutions to kind of replace the really good Session Manager from older Firefox). I was using this problem-free on Windows 7 64-bit at work. I still use this perfectly well at home on Debian GNU/Linux 64-bit (debian sid).
Then, 2 weeks ago I migrated my work Windows 7 machine to Windows 10, and also migrated my profile.
I had refreshed Firefox before the migration, so I had to install MySessions into the new profile under Windows 10.
What happens is that very soon, within minutes to an hour, MySessions stops Firefox from loading, refreshing, saving, or otherwise doing anything with its tabs. I need to disable MySessions add-on, reboot Firefox, can then work as usual, but need to re-enable MySessions if I want to see a tab labelled as "Replaced" (cannot easily load saved content of tab if MySessions is disabled).
I did not find any issue related to this, but if it helps MySessions is the only add-on I have installed.
On Windows 10 we use Micro Trends anti-virus, whereas on Windows 7 the company had been utilizing Symantec Anti-Virus software.
Since it has become unusable after migration, I am unsure if this is related to an interoperability issue with Windows 10, anti-virus software, or to migration issues.

This session manager works really well.
It can be left running in the background for a very long time. And if you're a person with many tabs and windows open simultaneously this tool will make your online life much more comfortable and less stressful.
And many of us have spent much time each time the computer needs a restart and we need to bookmark all tabs and windows.
This tool solves this easily with just one click.
I personally pair this addon with the addon called "Snap Links Plus" for a very powerful combo to be able to open many links into tabs, and then just bookmark them all before starting a research session.
Say for example you need to do research on a big dataset over at NASA for the latest data and images from Mars.
Snap the links, save the session. Next time you open up the session everything is where it was last time. Very powerful!
Big thanks to the creator of this addon! =)

Надо тестировать и проверять, чтобы понять заложенные алгоритмы - не все очевидно. Есть баги. Но, в целом - нормально.

Sometimes when I click to 'Remove' a session, it deletes the *wrong* session. Also, my date format (yyyy-MM-dd) is not honored for Auto-saved entries. I wanted to report these issues but can't register to mozillaZine (the site is horrible btw, you shouldn't be using it nowadays). I found the source code on GitHub and wanted to contribute (with fixes), but the code is terribly outdated.

Absolute Crap. More like a virus that will disable your web browser and refuse to allow you to delete the 'session' backups it creates. Stay well away and use any other Session Tool created by a competent developer.

这个扩展非常好用，非常喜欢。更新到最新版后出现一个问题。每天第一次启动Firefox后MySessions都会生成备份文件，如何取消备份呢？我没有找到取消备份的选项。

No source code provided despite it is distributed under MPL.

Menu is totally broken for several weeks now. All menu items seem out of place and it's impossible to navigate properly.

This happens in several computers (all running Ubuntu 18.04) and even in fresh installations of Firefox.

It works but I don't know why even when I've disabled all timeline and periodic saves, it is still running a background.js that pops up every min to dump a huge chunk of text onto my FF Browser Console log screen like :

"Array(17) [ "{\"title\":\"tempSession\",\"date\":\"7/8/2019_18:34\",\"tabs\":[{\"title\..........."

and that can fill up multiple screens.

Can CromS improve it by letting it stay idle if all I need is a save when closing Firefox.

An essential part of any modern browser for any power user *should* be a session saver. Best substitute I've found for the old session saver. Pretty basic but far better than nothing. As for problems, added sessions often don't show up for me in the interface, though are visible in bookmarks menu. Usually they show up when I restart, so not a big deal. Very grateful for this add-on!

This add-on is really great. I have been using it for a couple of years, now. It is really user friendly and it is great for saving multiple tabs on a subject and going back to them later. I couldn't be without it now. Thank you CromS for your hard work!

Hi, MySession seems more robust than Tab Session Manager (TSM uses indexDB; it's json got corrupted so I lost alll my sessions), but maybe you could consider implement this TSM good things:
-'save session on close' option [without using 'save each __minutes', *even when eg the PC unespectedly shuts down from energy failure*, amazingly it usually manages to recover the tabs.]
-it restores tabs according to the Firefox 'Container' each tabs is when saving the session, eg I can have a session with all/some 'Work' or 'Personal' Containers. [Maybe this can't be done in MySession since regular Bookmarks (only for now until new API?) can't save the 'Container' status?]
-it opens the session starting on the tab you were when saved [not necessarily on the 1st tab] eg while being in the last tab (eg 9 tabs, you were in tab #9, opening session starts in tab #9, not in #1).
-if you click to expand the list of tabs of a session, > click on any tab > only that tab opens in the window you are.
Thanks.
Edit: I guess I was wrong about the last point, so 1+star (only used the addon 1 time because from the proposals, at least I cannot forego the containers function.)
The reason for 3 is (using lazy Loading) eg I don't want always to load tab#1, but [in the example, it could be tabb5 or whatever] start in/only load tab9, then i after i close it, Tab8 loads, and so on, until i stop and close the window, without loading the 1st tabs. Without the function, before opening the session i would have to put FFx on 'work offline' before tab1 loads , then put FF 'onlne', then click tab9 etc. (or arrange the tabs in different order before saving the session.)
Thx.

thank you. it's a must have in my case.
would give 5 stars but recent update introduced some bugs. 1. whenever I open the browser MySessions options tab opens automatically. 2. also every single link inside this tab opens another options tab.
I'm using FF 66.0.5 x64 and MySessions 2.13.4, Win7 SP1 x64.
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edit: updating 2.13.5 fixed above problems. kudos to the Author for the immediate reaction. 5/5