Firefox's separate window title bar takes up space above the tabs. Customize Toolbar can hide it while keeping the browser's tabs and navigation controls visible.

The title bar shows the page or application name above the tabs. The Menu Bar containing File, Edit and View is a different interface element, with its own visibility control.

Window decorations vary across operating systems and Linux desktop environments. If Firefox already has no separate row above the tabs, the title bar is already hidden; the desktop's top panel is outside this setting's scope.

Related: Hide the system title bar in Google Chrome and Chromium.

Steps to hide the title bar in Firefox:

  1. Open Firefox's application menu using the hamburger button at the top right of the window.
  2. Select More Tools from the menu.
  3. Select Customize toolbar… to open the customization screen.
  4. Clear the Title Bar checkbox at the bottom left of the window.

    If the checkbox is missing, leave full-screen mode with F11 on Windows and Linux, or Command + Shift + F on macOS.

  5. Click Done to leave customization.
  6. Check that the separate title bar above the tabs is gone while the tabs and address bar remain visible.
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