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weird borders around sites in fullscreeen firefox

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i dont know why but when in fullscreen sites have weird borders around them it seems to be a firefox issue i dont know how to fix it.my computer runs windows 11 if that helps.

i dont know why but when in fullscreen sites have weird borders around them it seems to be a firefox issue i dont know how to fix it.my computer runs windows 11 if that helps.
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Letterboxing is a privacy feature to make the window size less fingerprintable, you can disable it by changing privacy.resistFingerprinting.letterboxing to false in about:config.