[[https://wiki.archlinux.org/index.php/Firefox#Unreadable_input_fields_with_dark_GTK.2B_themes|Source]]

in ~/.mozilla/firefox/xxxxxxxx.default/chrome/userContent.css

<sxh css>
input:not(.urlbar-input):not(.textbox-input):not(.form-control):not([type='checkbox']) {
    -moz-appearance: none !important;
    background-color: white;
    color: black;
}

#downloads-indicator-counter {
    color: white;
}

textarea {
    -moz-appearance: none !important;
    background-color: white;
    color: black;
}

select {
    -moz-appearance: none !important;
    background-color: white;
    color: black;
}
</sxh>
{{tag>firefox css}}