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website not scaled up to the browser

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how do i change this so website is scaled up to the browser (its not zoom option)

how do i change this so website is scaled up to the browser (its not zoom option)
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Chosen solution

privacy.resistFingerprinting.letterboxing = true in about:config caused the issue, turned it to false.

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I don't know where that extra margin/padding around the page is coming from. Does it affect all sites, or just Google? Any idea when it started?

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Chosen Solution

privacy.resistFingerprinting.letterboxing = true in about:config caused the issue, turned it to false.