I'm not quite familiar with how this works, I think Martin is the right person to ask about it.
I can dig if you want but I'd guess that this kind of stuff (the `:not(:-moz-lwtheme)` bits and such) is related: https://searchfox.org/mozilla- central/rev/9bc5dcea99c59dc18eae0de7064131aa20cfbb66/browser/themes/linux/browser.css#389-399 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1871644 Title: Top corners of Firefox windows have weird black protrusions from the rounded edges To manage notifications about this bug go to: https://bugs.launchpad.net/firefox/+bug/1871644/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
