macOS-urlbar-Firefox.md

• type about:config on address bar - set toolkit.legacyUserProfileCustomizations.stylesheets to true
• type about:support - click Open Directory on Profile section
• create new directory named chrome inside your default profile
• create new file named userChrome.css and paste the following code:

#urlbar {
  text-align: center;
  font-weight: 600;
}