URL Theme Switcher changes Firefox's theme color based on the site you are visiting. Pick a URL pattern, assign a color, and the browser chrome updates when a matching page opens.
Theme color follows the URL rules you set
Live preview while you choose a color
Match a whole site, a path, or subdomains
Rules are saved and applied automatically
English, French, German, Chinese, and Japanese
Development, staging, and production
Work vs personal accounts
Spotting a service at a glance (mail, GitHub, docs, and so on)
example.com => every page on that host
*.example.com => that host and its subdomains
*/dashboard/* => a specific path
Click the toolbar icon
Choose a pattern (whole site, this page, or subdomains)
Pick a color
Save the rule
No data collection. Rules stay in your browser. The add-on needs tabs (to read the current URL), storage (to save rules), and theme (to color the toolbar). It does not request access to website content. The project is open source.
