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Removing space between traffic lights and tabs on macOS

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Is there an option to remove the space between the traffic lights icons and tabs in macOS (highlighted on screenshot)? Somehow using userChrome.css maybe?

Is there an option to remove the space between the traffic lights icons and tabs in macOS (highlighted on screenshot)? Somehow using userChrome.css maybe?

All Replies (3)

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For some reason the screenshot did not attach initially. Adding now.

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What that the default install? No addons.

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Tried with a new empty profile, same result: