It seems to do most of what I expected. One part I had hoped is that it would remember window placement (where are they on screen ... and which virtual desktop are they on). Unfortunately, it doesn't do either. For me, this just seems to be another way to do what "Restore Session" already does.

Tab Session Manager has been a lifesaver, as Firefox's inbuilt Restore Session frequently doesn't restore all the tabs from the last session and puts tabs in wrong containers - TSM does this all perfectly. One annoyance - tabs restored with TSM seem to display the tab tooltip only once when hovering over a tab. There is no tooltip when hovering over the tab a second time. (I'm using Tree Style Tabs).
Update: discovered that tooltips always appear over over tabs that are in a container, but only once over tabs not in a container.

Nice but why is there nowhere in the settings stated (or a "switch-account") to which account I'm syncing? I can find out so it's not a huge problem, but it's also not a huge problem I think to just implement a mentioning somewhere in the settings ¯\_ (ツ)_/¯

Has stopped saving sessions automatically; must do so manually. Only sometimes registers when a window is closed and saves then.

EDIT: deleting any re-uploaded sessions seems to allow the extension to automatically save again.

I've been using Tab Session Manager by the developer sienori for years, and it has truly improved my browsing experience. This extension is incredibly user-friendly, offering a seamless way to save and restore browsing sessions with just a few clicks. Whether I'm working on a project, researching, or simply browsing for leisure, I can easily pick up right where I left off without worrying about losing any important tabs. The intuitive interface and reliable performance have made it an indispensable tool in my daily routine.

What sets Tab Session Manager apart is its versatility and thoughtful features. The ability to categorize and organize sessions, combined with the automatic backup functionality, ensures my sessions are always safe and accessible. It's highly customizable, allowing me to tailor it to my specific needs. As one of the Firefox Recommended Extensions, created by trustworthy developers, this extension meets the highest standards in security, functionality, and user experience. The developer sienori has done a fantastic job with regular updates and responsive support, making this extension a must-have for anyone looking to enhance their productivity and streamline their browsing habits. Highly recommended! 👍🏼

I've been using this add-on for years and I'm so happy with it , the only problem is that when I automatically loads the session at FF start , it opens a new window other than the one I already opened , I wonder if there is an option to make the saved sessions load in the same window I have already started

Is it possible to make an option to lock the extension so it requires a password to open your sessions?

BEWARE: the addon still seems to work OK for me, but since ~2021 improvements basically stopped and new changes are mostly to the list of donors. There's currently over 400 issues open in GitHub, and growing, with no answers. Cloud sync says it works, but not really. Time to start looking for alternatives.

Since Firefox sidelined Michael Kraft's best session manager, I've been wondering why Firefox doesn't have its own session manager. Simply collect the session restore files and display them clearly, like in Michael Kraft's Manager. One click and all the files are there again, even with the option to go forward and backward in time in the tab if you have been in the tab for a long time.

The best alternative to it is your Tab Session Manager. But it has neither the function to select individual tabs to restart or delete using a checkbox per entry or a select all/none checkbox, nor the option to move or organize tabs into other windows using drag and drop. It's also annoying that the favicons aren't loaded when you restart quick, so you no longer have any clues as to what was where until you load every single tab again. It shouldn't be too difficult to load these pictures, just like the other changes mentioned... Why not do it like Kraft and use the session store .json files to quick launch the tabs with favicons and site informations. That would be the best present you could make to the firefox world. :)

Is it possible to save a session as bookmarks, like in the Session Sync extension?

Works as advertised, except it does not restore window size and location across multiple monitors.

great add-on, but please add other sync options! currently only google is supported which collects personal data :(

Only saved 36 out of about 300 tabs in one portable profile. And does not load local web pages. though the URL is provided.