Save and restore the state of windows and tabs. It also supports automatic saving and cloud sync.

Chrome version:
https://chrome.google.com/webstore/detail/tab-session-manager/iaiomicjabeggjcfkbimgmglanimpnae
Edge version:
https://microsoftedge.microsoft.com/addons/detail/jkjjclfiflhpjangefhgfjhgfbhajadk

USERS:

Since updating to version 3.0.0, there is a problem that the session list can not be opened. Please see here for solutions. https://github.com/sienori/Tab-Session-Manager/wiki/IndexedDB-Error
Vote on Mozilla website for APIs/bug fixes needed by session managers, so they can be better. https://github.com/sienori/Tab-Session-Manager/issues/364

Version 6.12.0

Implemented Tracking Session
- You can set a session as a tracking session from the session menu.
- When you open a tracking session, changes in the window are automatically reflected in the session.
- This allows for efficient workspace switching!
Added option to track newly opened windows
- You can choose if newly opened windows in the tracking session should be included in the tracking

Version 6.11.0

Supported importing Firefox session store backups files
Improved login prompt not to appear during automatic cloud sync
- A red badge on the extension icon will notify you when manual login is required.
Improved the appearance of tags in autosaved and startup sessions
- Shortened the tag name and changed the tag icon.
Adjusted the color of the session list to improve visibility
Fixed an issue where importing Session Buddy files failed
Fixed an issue where upload of sessions with long names failed in cloud sync
Fixed an issue where "Open in current window" opens different order tabs when pinned tabs exists

Version 6.10.0

See more release notes
https://github.com/sienori/Tab-Session-Manager/releases

I was inspired by the following great add-ons, developed as an add-on for Firefox 57 or later.
Session Manager by Michael Kraft
http://sessionmanager.mozdev.org/index.html

Mozzarella

Tab Session Manager