Отключить кеширование DNS:
Открыть about:config , установить
network.dnsCacheExpiration => 0
network.dnsCacheExpirationGracePeriod => 0
Values in test input fields is not-visible in dark theme
- Open about:config in Firefox
- Create a new String value, named widget.content.gtk-theme-override
- Set a light GTK theme name as the value, for example Arc-Darker
- Restart Firefox
Work on version: 62.0 (64-bit)
Source: https://www.mkammerer.de/blog/gtk-dark-theme-and-firefox/