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since last update, Full Screen mobile add-on app no longer is full screen, doesn't use top 1/4" of screen on my Galaxy S3. Any help

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Before last firefox update on my Galaxy S3, the Full Screen mode add=on app worked fine. Since update it doesn't use 1/4" or so of screen and sometimes the tab page is visible behind the screen, just a little higher.

Before last firefox update on my Galaxy S3, the Full Screen mode add=on app worked fine. Since update it doesn't use 1/4" or so of screen and sometimes the tab page is visible behind the screen, just a little higher.

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Check for Addon update.

Otherwise Remove and Reinstall the Addons and Restart your mobile