My Firefox windows (started from a Plasma launcher or by Ctrl-N in Firefox) appear without a title bar. Other applications are fine. Using Windows action (Alt-F3) on a Firefox window:
More actions>No Border
is checked. I can un-check this but it only applies to the current windowMore actions>Specific applications settings>Appearance & Fixes
appear like below. Is it the right way to fix this? Or is there another setting upstream (which would explain what the setting is grayed out?)?
And above all, what could have caused the change?
Using Kubuntu 16.04
OK, so it's really Firefox fault. New capability in FF60(*). Found the "Customize" entry in the Tools menu (stripes icon) and the "Title bar" choice was unchecked.
At least my gut feeling that it was due to something else was right...
(*) Thanks to @pomsky for pointing this out