>>6686803In Windows the titlebar can be removed with:
#titlebar{display:none;}
but there can be side effects, such as Firefox locking itself in "full screen" (maximized on top of taskbar, can't un-maximize). In Linux your WM should support removing caption for select windows.
Another option is to use an extension like
https://addons.mozilla.org/firefox/addon/semi-full-screen and hide Firefox's own min\max\close buttons with CTR (addon) or CSS. And set it to not auto-hide tabs toolbar when in fake full screen mode.
