MySessions

The main task of this extension is to save sessions at any cost. As a repository, browser bookmarks are selected as the most reliable and secure storage.

The extension does not support "Firefox Multi-Account Containers" and "Tree Style Tab".

Why does MySessions require X permission?

Read and change bookmarks and access browser tabs. These are key permissions because all functions come down to bookmark bookmarks.
Store an unlimited amount of data on the client side: local browser storage is used to save the timeline: periodic session snapshots, daily session snapshots and session snapshots when the browser is closed.

Optional permission.
Download files, read and change browser download history: this permission is used to save session backups to a file.

Please note that in the Firefox version of this extension to resolve tab icons the following service is used: "https://icons.duckduckgo.com/ip3/{Domains_URL_of_a_tab}.ico".
We don't collect cookies, password, e-mails or any other confidential info.
Only domains (not full URLs) of the websites visited (if you allow) and nothing else.

You can import your sessions from the "Session Manager" from Michael Kraft https://www.youtube.com/watch?v=BspF2LhngDs

This extension uses bookmarks. If you actively use bookmarks, this extension messes your bookmark search.
The extension does not work in a private window, but a private session can be saved from a regular (non-private) window.
I repeat: this is not a replacement for the "Session Manager" from Michael Kraft. Rather, it is the Session Keeper with the possibility of their recovery.

https://www.youtube.com/watch?v=UgZFxV4cfuU

You can help with localization https://crowdin.com/project/mysession

Vote on Mozilla website for APIs/bug fixes needed by session managers, so they can be better. https://www.reddit.com/r/firefox/comments/7m8nvx/can_session_manager_tab_session_manager_coexist/drslt43/

Version 2020.1.1
- Changed version numbering.
- Added dark theme. Work in progress: suggestions, wishes, criticism are accepted.
- Disabled permission "Download files and read and modify the browser’s download history". You can turn it on if you need it.
- Disabled permission "Access recently closed tabs".
- Added opening the extension window in a new tab when clicking with the middle mouse button.
- Fixed saving session in TimeLine.

The change log can be viewed by clicking on the question mark in the popup extension window.