Created attachment 539815 [details] testcase 1. Enable tap-to-click (Mac system preferences > Trackpad > Tap to Click). 2. Load the testcase. 3. Tap the button. Result: no blue flash (or nearly-imperceptibly short blue flash). Expected: a solid blue flash, so I know Firefox accepted the tap and it landed on the button. See also bug 376119.
David, could we add some timer which clear active state, or can you see some problem in such behavior? If active state moves to some other place, the old active should be cleared immediately. It might be nice if we could have some animation, but that is hard, I assume.
Though, this could be OSX level thing.
It wouldn't make sense for the OS to delay the mouseup, because that would delay the action.
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