I can confirm that this is no longer problem with Ubuntu Gnome 18.04 with Firefox 58, Nautilus 3.26, Chromium 64 and Google Chrome 64
firefox: Installed: 58.0+build6-0ubuntu0.17.10.1 Candidate: 58.0+build6-0ubuntu0.17.10.1 Version table: *** 58.0+build6-0ubuntu0.17.10.1 100 100 /var/lib/dpkg/status 57.0.1+build2-0ubuntu1 500 500 http://za.archive.ubuntu.com/ubuntu bionic/main amd64 Packages nautilus: Installed: 1:3.26.0-0ubuntu1 Candidate: 1:3.26.0-0ubuntu1 Version table: *** 1:3.26.0-0ubuntu1 500 500 http://za.archive.ubuntu.com/ubuntu bionic/main amd64 Packages 100 /var/lib/dpkg/status chromium-browser: Installed: 64.0.3282.167-0ubuntu1 Candidate: 64.0.3282.167-0ubuntu1 Version table: *** 64.0.3282.167-0ubuntu1 500 500 http://za.archive.ubuntu.com/ubuntu bionic/universe amd64 Packages 100 /var/lib/dpkg/status google-chrome-stable: Installed: 64.0.3282.167-1 Candidate: 64.0.3282.167-1 Version table: *** 64.0.3282.167-1 100 100 /var/lib/dpkg/status Users on the KDE side will need to confirm if it is fixed or not. ** No longer affects: ubuntu-gnome -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to nautilus in Ubuntu. https://bugs.launchpad.net/bugs/1580168 Title: Tab descriptions are unreadable, black text on black background Status in firefox package in Ubuntu: Confirmed Status in nautilus package in Ubuntu: Confirmed Bug description: When I hover the mouse button on top of the Firefox tabs, the tab descriptions are unreadable, black text on black background. This also happens on some other web sites which pop up a description box, e.g. on portal.azure.com when hovering over your username in the top right corner in the browser. This probably started happening when Firefox was first compiled against gtk3. My gtk3 theme is oxygen-gtk. 1) The Kubuntu release is 14.04.4 2) The version of Firefox is 46.0+build5-0ubuntu0.14.04.2 3) I expect to be able to read the tab descriptions 4) The tab descriptions are black text on black background To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1580168/+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