Tab Session Manager is everything I expect from it. But:
I have chosen 'Restore previous session at startup'. On the other hand, I frequently use Firefox feature 'Send a tab from Firefox on Android to other device'. That means, I share and send many URLs from my Phone's Firefox to my Desktop's Firefox, while my PC is shutdown. Whenever I open Firefox on my desktop, the browser receives and opens those in new tabs.
Here's the catch: these shared tabs are opened at the startup, before Tab Session Manger restores my previous session and when it restores the session, it completely wipes the received shared URLs' tabs. If developers find a solution for this annoying behavior, it would be great.

Very good at saving tab states, even in disastrous scenarios. However, it does not play well with "Tiled Tab Groups". While Firefox's default session save function (in the rare scenarios in which it actually functions properly) will restore with the tab groups intact, Tab Session Manager will destroy the group states, and loads them all in a single group. I'd suggest then that it simply doesn't seem to respect hidden tab statuses? That said, still the best we've got in Quantum by a mile so far.

How to export sessions outside Firefox? Thanks!

Пожалуй самое удобное и хорошо зарекомендовавшее себя расширение, пользуюсь больше года и не подводило до недавнего времени, когда количество вкладок перевалило за 400!! Теперь программа не открывает окно с выбором сохранений, сбрасывал настройки, удалял и ставил по новой.. не работает ((

Works great but does NOT Support Multi-Account Container. Every time session is restored, you'll have to reopen the tabs in the desired Container which is really annoying. Otherwise, it's a great must-have add-on.

Works great but the only issue I have is when i restore a session sometimes it will also restore my bookmarks and open them up in tabs so a session that was like 5 tabs when I restored it suddenly has over 100 tabs.

>>>PLEASE ADD ABILITY TO "LOCK" SAVED SESSIONS! The delete button is not forgiving, (no undo/undelete...and the "restore" option only lasts a few seconds!)....so please add option to LOCK, located next to the OPEN and DELETE options. thanks...great app. *********please update as soon as you can! THANKS AGAIN! :)

OPEN - DELETE - LOCK!

I've only used this for a few weeks but I feel like this add-on has changed the way I browse already. It's wonderful to save sessions for different purposes, like one session of looking at Emulation websites, one session for seeing sites about a certain game/show or another session for my work/email. No longer do I have to keep one of each around to switch to a different kind of browsing and have the associated memory usage. I can open my browser to a single new tab and use session manager to find the session I want to use. I give it 4 instead of 5 due to a IndexDB issue which thankfully solved itself upon browser reboot, it hasn't popped up again but it does pose a reliability issue for the add-on.

Highly recommended, should be a feature for stock browsers in the future IMO.

Makes functions more accessible!

сделайте возможность, чтобы в пользовательские сессии можно было добавлять отдельные вкладки
make it possible to add individual tabs to existing user sessions

Hi, this Addon is very useful, but can you please fix the display of the "favicon"? if my session is restored, all tab-icons are missing. They'll refresh when i click on tab, but i want them always. Thank you!!

Problem with FF 64.0b4 and TSM 4.2.0:
Option: "Use the "discarded" property"
prevents to open more then one window!
Otherwise a very usefull addon.

Очень не хватает экспорта настроек дополнения

After i couldn't use the good old session manager from Michael Kraft even in FF ESR any more i was looking for an alternative. In TSM i can import my old sessions from SM. Overall it works well, although atm i don't like it quite as much as the old SM.

For years I used "Session Manager" but then I updated Firefox one day and got a message that it was not compatible that's when I found "Tab Session" by sienori. I have been using it for around 1 year? and it has worked great. There is a number of configuration options but no real complaints.

Quite good. But I am still looking for a function that the back/forward history can also be saved for each tab (This can be done in Michael Kraft's Session Manager). Support!