Tab Session Manager （作者：sienori）

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

• 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

Chrome version: https://chrome.google.com/webstore/detail/tab-session-manager/iaiomicjabeggjcfkbimgmglanimpnae

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://www.reddit.com/r/firefox/comments/7m8nvx/can_session_manager_tab_session_manager_coexist/drslt43/

Version 4.1.0

• Added search bar to popup
  • You can disable it by option
• Added option to select behavior of popup save button and open button
• Added option not to display option page at update
• Fixed problem that color scheme was unreadable depending on OS theme
• Fixed problem that lazy load page can not be read when updating from version 3

Version 4.0.0

• Supported Google Chrome
  • Firefox and Chrome sessions are compatible
• Improved menu and notification interface on popup
• Improved stability of session restore option on startup
• Improved speed of opening session when TST option is invalid
• Remove backup limit upper limit option
  • This option was not working properly

Version 3.2.0

• Speed ​​up session restoration
  • Changed to restore multiple windows simultaneously
  • Changed to open tabs without waiting time when Tree Style Tab support option is disable

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 https://addons.mozilla.org/ja/firefox/addon/session-manager/