After updating to the latest version of Tahoe the extension has now hung around after one reboot. Safe to Tahoe now that is is .1? - #8 by bjornivarsson
Edit: For me no luck. The extension is gone again. After reboot it worked but then all of a sudden it disappeared.
Edit # 2: And now it’s back 
No reboot done between first entry and Edit and no reboot between Edit and Edit 2.