Did you notice that Firefox Web Browser has no titlebar on Ubuntu 24.04? If you look closer, you will figure out the top most of its window is the tab bar and you never see program name "Firefox" as well as website name in full "Enterprise Open Source and Linux | Ubuntu" --for example-- you are currently visiting. If you don't like that, you can bring titlebar back by following this.

 (Picture of Firefox visiting Ubuntu website with the titlebar visible)

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