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Windows 7 display brightness effected when firefox is running, even when in another task.

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Whenever I have Firefox browser running on my Dell Window 7 64-bit laptop, the screen appears to become very bright. If I change to another program, the screen remains bright for a several minutes then goes back to it's normal settings. If I change tasks back to Firefox the problem repeats. This started after the latest update to Version 56.0 (32-bit). If Firefox is not running on my computer, everything is normal. What is happening?

Whenever I have Firefox browser running on my Dell Window 7 64-bit laptop, the screen appears to become very bright. If I change to another program, the screen remains bright for a several minutes then goes back to it's normal settings. If I change tasks back to Firefox the problem repeats. This started after the latest update to Version 56.0 (32-bit). If Firefox is not running on my computer, everything is normal. What is happening?