A is page content on the original tab; 'a' is flash content on original tab. B is page content on the new tab. I'm seeing AAAA AAaA AAAA (click on tab B) BBBB BBaB BBBB (after a tiny amount of time) BBBB BBBB BBBB It makes the transition feel slower, and that flash is faster than we are. Also kinda ugly. My graphics info: http://grab.by/grabs/1f85f0935ba35edb7f668f3c05d3a199.png
It either has to appear a little early or a little late with the current setup. It should be arriving late on Windows though, so we should look into that. Post-FF4 we can reduce the delay more when we reorganize things to make all painting happen through the refresh driver.
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