User Highlighter^[1] (source) is a user script that highlights links to userpages, user talk pages, and contribs pages of administrators, as well as other user groups as listed below.

Disclaimer: This script is kind of old. Since I forked it several years ago, several users have made further improvements to the script, which can be viewed at WP:US/L.

Groups are listed next to their colors and the number of users in that group. The list is in order (e.g., if a user is an arb and an admin, they will be red).

• Steward:   ×~40 (Example)
• Bureaucrat:   ×15 (Example)
• Interface administrator:   ×15 (Example)
• Arbitrator:   ×~15 (Example)
• Oversight:   ×46 (Example)
• CheckUser:   ×47 (Example)
• Admin:   ×813 (Example)
• Former admin:   (Example)
• Template editor:   ×206 (Example)
• Pagemover:   ×459 (Example)
• Patroller:   ×872 (Example)
• Reviewer:   ×8,242 (Example)
• Extended confirmed:   ×80,672 (Example)
  • Same color used for trusted IPs
• Jimbo Wales gets a 🏴󠁧󠁢󠁷󠁬󠁳󠁿 Wales flag emoji displayed before his username, and Larry Sanger gets an 🇺🇸 American flag emoji

• Rollbacker:   ×7,063 (Example)