Titlebar-less view for Linux

Just as Mozilla did in Firefox 59 (you can check it out in Firefox Nightly atm), and someone was doing for the Mac version in #12377, it would be really good to have an option to integrate the title bar in the same row where the tabs reside, in order to save some vertical space (which is even more important if like me you usually work on a non-FHD laptop such as an old Thinkpad or a Dell Latitude).

I said in Gnome cause it's what I use, but maybe it could be made into a more portable solution that has options for all DEs with top bars (be it Mac, Gnome, Xfce...). Like Mozilla did, it could even start to roll out when just some DEs are supported, with the warning that it may not work on all systems.

I've just seen the titlebar-less ideas for Windows on #17060 too and I think any design idea used there can easily be converted for Gnome/Xfce/most Linux DEs as they too have the three buttons on top right.

[LastLightSith]

It will be very nice it this happens for XFCE

[denidiasjr]

Any news about this issue? The title bar take a lot of the screen

[ZanderBrown]

It would be important on Linux to try and respect peoples choice of controls (e.g. GNOME only have close by default but I have minimise & close) but this would be really nice to have

https://wiki.gnome.org/Initiatives/CSD

[furai]

Would be really nice to be able to remove titlebar, maybe similar to how Firefox have done it.

[SurajVerma]

In Version: 1.25.1, choosing custom title bar style did the trick for me, it merges menu bar and title bar into one, although the look is not very neat, but it saves at least some screen space.
Try it. It's nice.

Go to File>Preference>Settings and in user settings write "window.titleBarStyle": "custom",

I am on Ubuntu 18.04 LTS