How can I remove the header in firefox? It shows the title of the page I am on, which is already showed in the name of the tab, as well as the name of the window on the panel...
You can consider installing an add-ons.
Hide Caption Titlebar Plus 2.7.2
"Maximize your screen space by controlling the presence of Firefox window Title-bar (Caption) & borders!", to be like Chrome Browser. - Hide FF's caption with 'smart' options, *optional* custom caption & resizers. - Works with ChromiFox-like themes.