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The style is usefull
This style is helpful for Facebook, but it looks it should not affect any sites except the FB. But it affects. You also have the strange unused option for the style. So, my suggestions is:
1/ Make the style facebook-only by adding the -moz-document section
//your original code goes here
as described here: http://freestyler.ws/help/coding
2/ Remove the unused style customization option.