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This adds Tab-Manager page.

This addon show tabs list, and you can swipe a tab to close.
It open Tab-manager page, when click this addon's icon (in address bar).
You can bookmark Tab-manager page.

This does not work well on Fenix. (Firefox version 69 or later)

WebExtentions of Firefox for Android 58 can't these.

• Sort or move tab
• History
• Restore session
• Bookmark
• Top site
• Dupe 'about:*'
• Show favicon

note
"Recent Urls" can not restore session.