User CSS

Screenshot of User CSS extension showing the style manager

An extension for Safari 5 to Safari 11 that allows the user to override stylesheets for any web page with real-time updating of web pages. It is no longer maintained due to deprecation of JavaScript-based extensions in Safari 12.

The extension is licensed under MIT license.



Due to a limitation with Safari's URL parsing, domain wildcard only works for subdomains. For example, http://**.google.* will not work. You must use http://**

Database for User CSS is stored at ~/Library/Safari/LocalStorage. You can access this directory by pressing Cmd-Shift-G in Finder. The database file is named safari-extension_com.gridth.usercss-v892bvzc73_0.localstorage


Version 1.3.2 (July 31, 2011)

Version 1.3.1 (January 11, 2011)

Version 1.3 (January 8, 2011)

Version 1.2 (September 18, 2010)

Version 1.1 (June 15, 2010)

Version 1.0.1 (June 11, 2010)

Version 1.0 (June 10, 2010)