I often have a lot of 100+ tabs open. Sometimes I start the browser and all the tabs are gone and start searching on the Internet how to restore the previous session, it is often very difficult to do.
It would be convenient to have a folder in bookmarks with a backup of open tabs.
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Some similar ideas for saving/restoring sessions:
Shortcut to Restore previous Session
Save a window and all it's tabs to be recalled at a later time to free resources