Why does Firefox's Maximize/Minimize tab in the bottom bar switch alternately from Green to Grey?

I am running Firefox 3.6.13 under Mint 9, LXDE Edition. I've noticed its Maximize/Minimize tab in the bar across the bottom of the screen blinks alternately between green and light gray. I've never witnessed this phenomenon while running Firefox under other Linux distros or Windows. Does anyone know what it means?
Many thanks.

Hi,
You can try to right-click the taskbar icon, '''Unpin''' it and later '''Pin''' it again. The [http://answers.microsoft.com/ Windows forum] would have different solutions to the problem.

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Why does Firefox's Maximize/Minimize tab in the bottom bar switch alternately from Green to Grey?

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