Many of Text and Dropdown-Boxed are showing with a black Background on my freshly installed Fedora 30 with FF 67.0.4 (64-bit). Example (http://www.sibeliusbad.de/aformulare/formular_bs_datenschutz.php) Which sometimes results in Dark color text on black background, which makes it unreadable. Only Example at hand is behind a login :( (https://kundencenter.goneo.de/index.php?akt=emaildomain) I tried to switch the default firefox themes default/dark/light and tried various system themes but nothing changes. Changing the entry "Override the colors specified by the page with your selections above" under "Preferences->Color" does change it but now all sites look bad. All threads i found trough google which seem to address this problem seem to be really old or point to wrong solutions like editing "widget.content.gtk-theme-override" which i cant find in "about:config". Can someone please help me fix this?