Oh come to think of it, there is a commonality between Firefox, VLC and Chrome. That is they all try to follow the system theme but all three are NOT GTK apps. They each use different toolkits. So I fear this is the same basic problem that will need to be fixed in three different toolkits.
** Package changed: gtk+3.0 (Ubuntu) => ubuntu ** Package changed: ubuntu => firefox (Ubuntu) ** Also affects: chromium-browser (Ubuntu) Importance: Undecided Status: New ** Also affects: vlc (Ubuntu) Importance: Undecided Status: New -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to gtk+3.0 in Ubuntu. https://bugs.launchpad.net/bugs/1872844 Title: Changing theme Light<->Standard preserves theme for Firefox title bar (in Xorg sessions) Status in chromium-browser package in Ubuntu: New Status in firefox package in Ubuntu: Confirmed Status in vlc package in Ubuntu: New Bug description: This is Ubuntu 20.04 beta. Start a program that has title bar. Try Firefox or whatever. Then navigate to settings->appearance. Now set the theme to Standard, then Light - Firefox will now have white theme with dark titlebar. Setting to Dark resets the bug. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/chromium-browser/+bug/1872844/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp