Tab Folders от Zoltan

If you have more than 10 tabs always open, this app is for you!

This extension is a tab organizer and a bookmark collection in one. It uses the most organic folder concept.

How to use:
Create folders, sub-folders, and store the shortcuts to your tabs in those. The shortcuts show the last screenshot of the page, so you can easily identify the page you need and select the already loaded tab.
If you close the tab later, the shortcut still remains in your folder, so you can easily reopen the pages. (bookmark function)

Install the add-on, and it will be visible on the left at all times.
Create folders and sub-folders as needed.
Click on each of your tabs one by one, refresh the page to load the extension and drag and drop the shortcut into the desired folder.
After all your shortcuts are moved,adjust the position inside the folder.
Optional: Export the whole structure to a JSON file and keep this file in a safe place. You can import this on a new device or whenever you lose your settings.