It is a Firefox bug. More details here with the link to the bug report https://github.com/NicoHood/arc-theme/issues/34
** Bug watch added: github.com/NicoHood/arc-theme/issues #34 https://github.com/NicoHood/arc-theme/issues/34 ** Changed in: arc-theme (Ubuntu) Status: New => Invalid -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1745637 Title: CSD for FIrefox look awful with Arc theme To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/arc-theme/+bug/1745637/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs