Fix for unreadable input fields with dark GTK+ themes based on Arch Linux Wiki instructions for Mozilla Firefox.
The css sets input fields to standard black text / white background; both can be overridden by the displayed site, so that colors are seen as intended. Also fix white font color in light background pages.
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Mozilla Firefox (https://www.mozilla.org/firefox/)
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Stylish addon (https://addons.mozilla.org/en-US/firefox/addon/stylish/)
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GIFDT-fix for Stylish (https://userstyles.org/styles/148092/gifdt-fix-global-input-fields-on-dark-themes-fix)
Using your distro package manager is recommended.
Arch Linux
$ sudo pacman -S firefox
Ubuntu / Linux Mint / ElementaryOS (on Debian, Firefox ESR is the default web browser)
$ sudo apt install firefox
After install Firefox, open it and then access the Stylish addon page and click install. Once Stylish is installed, access the GIFDT-fix page at userstyles.org and click install.