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FireFox

Disable DNS cache

Открыть about:config, установить

network.dnsCacheExpiration => 0
network.dnsCacheExpirationGracePeriod => 0

Values in test input fields is not-visible in dark theme

  1. Open about:config in Firefox

  2. Create a new String value, named widget.content.gtk-theme-override

  3. Set a light GTK theme name as the value, for example Arc-Darker

  4. Restart Firefox

Work on version: 62.0 (64-bit) Source: https://www.mkammerer.de/blog/gtk-dark-theme-and-firefox/

Firefox, Thunderbird start too slow on Manjaro XFCE

Solution 

sudo pacman -Rdd xdg-desktop-portal-gnome
sudo pacman -S xdg-desktop-portal-gtk

Source: https://forum.manjaro.org/t/slow-run-firefox/142268/4

Set font for address

Set value in about:config 

toolkit.legacyUserProfileCustomizations.stylesheets: true

Add file content 

# ~/.mozilla/firefox/4ucrir12.default-release/chrome

cat < EOF >> userChrome.css
#urlbar-input,
#urlbar-scheme,
.searchbar-textbox {
    font-family: "JetBrainsMono Nerd Font" !important;
    font-size: 14pt !important;
}
EOF