Firefox titlebar becomes black when I chooce to hide it

Hello
I use cinnamon. When I try to hide firefox title bar, it just turns black and continues to consume the same space on my screen. Any ideas why is this happening.

Try with a clean profile. Try with all extensions disabled. Try with a different system theme.

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You mean when you go fullscreen? What do you mean by hide the titlebar?

In about:config reset the value for
browser.tabs.drawInTitlebar

OK the problem was the theme.
I didn’t expect it since it was the default theme.

Thank you for the answer.

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