Thank you!!! I seem to tear off tabs accidentally, and this puts them back pronto. Unfortunately, I can no longer move tabs to a new window at all now, without disabling the extension from Add-ons Mgr. I know webextensions are limited, so it's probably not possible to disable only tab tear-off and not other methods of moving tabs to new windows. Could you perhaps provide a toolbar button to enable/disable this extension, that we could e.g. place into the overflow menu for easy access on the occasional time we really do want to move tabs to a new window? (Or some other method to temporarily override the behavior.) That would make it perfect!