On the latest nightly build for Mac, when I click the bookmarks toolbar button, the menu animates out from under my mouse pointer and seems to sometimes highlight the first item in the menu when it should not. It sometimes looks like a quick flicker and other times the highlight sticks, even though the mouse pointer is well above the final resting point of the menu item after the animation completes. If we can suppress that hoer state, it would probably make the animation look and feel more polished. (Assuming what I'm seeing is confirmable.)