Known issue upstream. It is a years old Firefox issue - workaround as described here:
https://github.com/NicoHood/arc-theme/issues/41 ** Bug watch added: github.com/NicoHood/arc-theme/issues #41 https://github.com/NicoHood/arc-theme/issues/41 -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to firefox in Ubuntu. https://bugs.launchpad.net/bugs/1699605 Title: Panes in Thunderbird and Firefox unreadable Status in arc-theme package in Ubuntu: Confirmed Status in firefox package in Ubuntu: New Bug description: Arc-darc theme for budgie provides a comforting color scheme. However fonts and background colors in thunderbird (HTML messages) and firefox (input fields, text entries) are hard to read as the bgcolor and fgcolor differ only slightly (dark blue to dark gray). Is there a way to fix this? (I tried to work myself through the css file but did not find any indication which element is responsible) ProblemType: Bug DistroRelease: Ubuntu 17.04 Package: arc-theme 20170302-0ubuntu1 ProcVersionSignature: Ubuntu 4.10.0-24.28-generic 4.10.15 Uname: Linux 4.10.0-24-generic x86_64 NonfreeKernelModules: wl nvidia_uvm nvidia_drm nvidia_modeset nvidia ApportVersion: 2.20.4-0ubuntu4.1 Architecture: amd64 CurrentDesktop: Budgie:GNOME Date: Wed Jun 21 23:24:03 2017 InstallationDate: Installed on 2017-05-25 (27 days ago) InstallationMedia: Ubuntu-Budgie 17.04 "Zesty Zapus" - Release amd64 (20170412) PackageArchitecture: all SourcePackage: arc-theme UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/arc-theme/+bug/1699605/+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