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Rated 5 out of 5 stars
Lightweight addon @ 4kb
After restoring Firefox Profile using MozBackup , This addon does not work , But it shows up in addons manager To make it work , I have to disable and again re-enable add-on from add-ons manager and restart firefox
Also available as UserStyle : http://userstyles.org/styles/42417/tabs-in-titlebar-in-restored-window