Отличное и весьма удобное дополнение, поэтому здесь нечего добавить

Easy to use and simple

Although not updated for some time, this add-on has consistently worked for me for over 5 years. It's been my go-to research tool when using Firefox. Bookmarks are OK but fall short when trying to do some concerted research but this session manager is fantastic. It's never failed me and syncs easily between devices using Mozilla Sync. Thanks to the dev for this gem and hopefully it stays updated as Firefox progresses.

This addon does what firefox sync should do. And it does even more. You can setup collections of links. Fortunately firefox sync does sync bookmarks reliably. But it fails in syncing tabs in a reliable way. Here session sync comes in as a convenient workaround.

I use Session Sync since 3 years now and it worked super for me, fast, reliable and neat to use. After a recent computer breakdown, at the computer store they made a new operating system installation and a minor recovery of my data. Mr.Ivanica helped me providing precious information and all the support in order to get the extension back at work again with all my sessions 100% restored.

Extremely useful addon. I have used this for at least 3 years.

The best out there.

Great add-on! Pinned tabs are saved, but not restored as pinned in Firefox on Linux. It would be fantastic to be able to find duplicate tabs also! Cheers!

Great add-on. I wish there are options to change the colour or theme of the interface. Something even basic, like; light, grey and dark.

Excellent!!! very few plugins are as useful as this one. I like to have many tabs open and this tool allows me to manage them in a spectacular way. Thank you very much!!!

I hope that in the future it will continue to be updated, even if they don't add more features, it should be incorporated by Firefox natively.

Excellent add-on, highly intuitive.
The ability to dock this in to native FireFox Sidebar would be awesome (Simple Tab Groups has this option). Currently using Tab View working great - thanks!!!

Awesome and intuitive right out of the box.

This add-on is the best there is for this kind of functionality. After 50 years of evaluating software, I have believe the simplicity of relationship between screen design and functions is responsible for the best software, as long as it works and does the functions. Session Sync does all three well. I have not encountered glitches and it is far superior in user interface and functionality, than any other tab manager.

I had issues with another add-on that did not behave properly and also interfered with Session Sync. When I had this problem I researched and used other tab managers. They don't come close. By deleting the errant add-on, Session Sync is back to working flawlessly and I can dump them!

The developer communicates in a responsive and timely manner, and actually works with you to support the product.

Amazing.
I have been using it for years.
Also open source and without dangerous permissions.