Hi ilovetobewifu

Click firefox button(orange button) then select Options and CHECK Menu Bar

or

Right-click on an empty section of the Tab Strip and check Menu Bar in the pop-up menu.

see more about firefox button : Display the Firefox button menu instead of the menu toolbar

thank you

Firefox shows either the Menu bar or the orange Firefox menu button.
If the Firefox window is maximized and the Tab bar is on top then the Tabs are drawn in the title bar.

You can look at these prefs on the about:config page.

• browser.tabs.drawInTitlebar
• browser.tabs.onTop

Current Firefox versions only show the "Tabs on Top" menu entry in the "View > Toolbars" menu and in context menus if the tabs aren't in the default position on top.

If the tabs are on top and the menu entry isn't available and you want to move the tabs below the navigation toolbar then you need to flip the browser.tabs.onTop pref to false on the about:config page.

• http://kb.mozillazine.org/about:config

Thank you!

When I toggled browser.tabs.onTop on the about:config page, the space appeared again, the tab bar went down under URL.