Hide Tab Bar in Firefox 57+

Finally I've found a way to hide tabs from Firefox.
I use Tree Style Tabs addons and don't need native tabs.

So here is how you can do it:

Create a new file in your browsers' profile: ~/.mozilla/firefox/somestring.default/chrome/userChrome.css
and add following content:

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@namespace url("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"); /* only needed once */ /* to hide the native tabs */ #TabsToolbar {     visibility: collapse; }   /* to hide the sidebar header */ #sidebar-header {     visibility: collapse; }

Restart your browser and enjoy!