http://bugzilla.opensuse.org/show_bug.cgi?id=1091592 http://bugzilla.opensuse.org/show_bug.cgi?id=1091592#c2 --- Comment #2 from Mircea Kitsune <sonichedgehog_hyperblast00@yahoo.com> --- Created attachment 768815 --> http://bugzilla.opensuse.org/attachment.cgi?id=768815&action=edit Screenshot of the double titlebar Just great. Apparently this isn't a bug but some sort of new feature: It's called Client Side Decorations (CSD) and it basically means that Firefox now embeds and may use its own window manager, because why not break the OS with unnecessary functionality? First off I created a KWin window rule to force the normal titlebar to show up again. This causes two titlebars to appear, as visible in the screenshot I'm attaching here. I next had a chat on the Firefox IRC channel about this. Folks kept saying that it should be possible to disable with browser.tabs.drawInTitlebar in about:config, but that setting doesn't work for me and isn't intended until Firefox 60 from what I hear. The only thing that makes it go away is running FF with the following environment variable set: export MOZ_GTK_TITLEBAR_DECORATION=none I'm leaving this open in case the openSUSE crew can fix it in 59 so we don't have to wait until 60 for a solution. This clearly breaks the Firefox window for KDE users, and also looks ugly as it breaks the theme so many of us don't want it... additionally I understand the GTK client decoration shouldn't even be supported in version 59, so this shouldn't even be happening at all. -- You are receiving this mail because: You are on the CC list for the bug.