Affects: - internal sites (about:config) - external sites (duckduckgo.com, moje.zuno.cz...)
bug in about:config is here - https://bugzilla.mozilla.org/show_bug.cgi?id=1163954
The external sites fails because of hardcoded white background.
Unchecking "Use system colors" fixes this issue and that option has been changed to not be set by default: https://bugzilla.redhat.com/show_bug.cgi?id=1226489 However, this still does not fix the problem of form fields using incorrect colors.
*** Bug 1306595 has been marked as a duplicate of this bug. ***
This bug appears to have been reported against 'rawhide' during the Fedora 24 development cycle. Changing version to '24'. More information and reason for this action is here: https://fedoraproject.org/wiki/Fedora_Program_Management/HouseKeeping/Fedora24#Rawhide_Rebase
This is fixed on 46.something and 47+ builds imho. See also https://bugzilla.mozilla.org/show_bug.cgi?id=1216658 and https://bugzilla.mozilla.org/show_bug.cgi?id=1158076