Tab Session Manager by sienori

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

• Save and restore windows and tabs
• Manage sessions with name and tags
• Auto save when window is closed
• Auto save at regular intervals
• Import and export sessions
• Compatibility with Chrome extension
• Cloud sync
• Support tab groups
• Import Session Buddy

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

• Added the ability to import and export settings
• Supported the import of Session Buddy session files

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