A dongle!! Great word McDave--- I've removed these from old camp chair covers and used them just like your tab, but now I know what it's called.
There's a little spring on the snares I use for coyotes called the Whammie. Dongle might be an even cooler word.
Sorry OP--- as McDave said-- that little device will hold it in place. I use shock cord, set my dongle tightly against my middle finger and then put on and remove using the stretch of the shock cord.