zilo
1
I believe the feature is still experimental hence has not been enabled by default.
Type (without the quotation marks): “about:config” in the addressbar
Search for:
“browser.tabs.drawInTitlebar” toggle “true”
“widget.allow-client-side-decoration” toggle “true”
Restart Firefox.
There is a slim white bar at the top… doesn’t bother me
tsu2
2
If you’re reporting what you think is a bug, you should submit a new bug to https://bugzilla.opensuse.org
TSU
zilo
3
I am not reporting a bug. A bug has already been reported under mozilla under https://bugzilla.mozilla.org/show_bug.cgi?id=1283299. This is a workaround on removing the titlebar.