100% reproducible with Xubuntu 18.04 regardless of theme (over 20 installed). Looking for an upstream report.
-- You received this bug notification because you are a member of Desktop Packages, which is subscribed to thunderbird in Ubuntu. https://bugs.launchpad.net/bugs/1725588 Title: [regression] borders around tabs in preferences are invisible Status in thunderbird package in Ubuntu: Confirmed Bug description: Potentially related with [1]. Reproducible in TB 1:52.4.0+build1-0ubuntu2 with default theme for both TB and Ubuntu. Screenshot attached. [1] https://bugs.launchpad.net/ubuntu/+source/thunderbird/+bug/1721189 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/thunderbird/+bug/1725588/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp

