cannot resize firefox window while colorfultabs enabled

trying on two different windoze computers with firefox 57.0 syncing between them

starting today, every time I enable Colorfultabs I can't resize any open firefox windows. The mouse pointer never changes to the little bar with arrows on each end. Also, firefox gets a white boarder around the entire window (where I would grab to resize). Typing this message in it now, everything else appears fine.
if I disable Colorfultabs 32.0, all returns to normal and I can resize the firefox window.

First time posting, sorry if this is in the wrong spot. let me know if I can provide other info. Assuming it might just be conflicting with another Add on.

thanks, Colorfultabs is great!!