Works great for me. Importing .sessions files from Session Manager worked just fine. Will it be possible soon to save the tabs from a single window, not just all open windows? That would greatly increase its usefulness.

Thanks for adding the lazy loading of tabs. Now I can load my 200+ tab session and all the tabs with their names and icons appear, but they don't load until I click on them. Great job. :)

Usefull

Some people can say, use CTRL + SHIFT + T, But I can't save a session about last month this way and control what page I will open.

Best session manager for FF57 so far.
Keep it up.

I've been testing it for two weeks and it works fine.

can be better if can choose to save individual of windows or tabs as session.

Does what it says on the tin. The new update gives export options, so it's even better.

It is the best for now. Session manager was even better but the important things are:

it is open source;
it can import sessions saved by session manager.

In fact too many times I had to lose all my sessions after moving to a new "session manager" addon.

My question is, what for is the permission for downloading files and READ AND MODIFY download history, on top of that, required. That's sneaky and suspicious.
Yeah... That simultaneous loading of all tabs is a disaster...
I'd also vote for a "saved sessions list compact view" option. Like one-two text lines without much space-eating decorations.
Anyway, thank you for active development and support for Tree Style Tabbar! Your addon is indispensable, irreplaceable and a kind of a savior these days!

I had to get this extension as a replacement for "Session Manager" as the new Firefox doesn't support that one anymore. It's a 5 star program and I absolutely hate giving anything less than five stars...but the only reason why I have is because for work I have tabs open to local html files I created myself, and every time I restore my tabs with this extension it only opens up web pages from the actual web and never opens up my local html files that I need which makes me have to go and open them up one by one. I could do it myself, but I got this extension to keep from having to take time to do that so I don't mix them up and can start working right away. Also, it doesn't ever open all the tabs when there is more than one window saved, usually meaning I have to open up all the tabs myself in the second window as well. Hopefully it can get updated soon. It's DEFINITELY much faster than Session Manager, but I need it to save and open all the tabs ^_^

56まで使えたアドオンFEBEのように、アドオンの設定やテーマの画像、ブックマークデータなど全てのデータを一括バックアップできるようになると、Firefoxを再インストールしたり、新しく使う際にとても助かります。
お手数ですが、ご検討よろしくお願いいたします。

I had to find a replacement for the old Session Manager, which worked well until FF57, and then not at all.
I give kudos to the author of this add on for going to the trouble to provide an extension that substitutes for the legacy Session Manager in part. If it can duplicate more of the functionality of the older extension, it would rate FIVE stars for sure. But I thank the author and rate four stars at this time.
There are issues which I hope can be dealt with as this extension develops:
- I had a large 196 tab session saved, which Tab Session Manager shows OK, but when I try to open the session, only a portion of them do load. There seems to be a limit here. It would be nice if there was not.
- I note the latest version 1.5 has an option to Export the tabs (I presume as a list of links), but I haven't located this feature. This would enable me to sort through the 196 tabs mentioned in the previous point, so I hope I can find it - FOUND IT! Cool. Oh, but it only exports as a .json file which is not so useful. Update: but it is not to hard to manipulate the file with Notepad++ using "windowId": value to extract the tabs from a particular session.
- I echo the statement of "Anonymous user 8e0130" who asked "Is there anyway to have it not load non-active tabs?"
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This addon used to work perfectly, but unfortunately won't load sessions anymore