UserChrome.css

userChrome.css in the chrome folder is a CSS file that can be used to change the way Mozilla applications' interfaces look. This file does not exist in a new profile. You can create it manually.

Editing

This file is designed to be manually edited using a text editor. Anything valid in a CSS file is valid in this file. To make the changes take effect, you must restart the application.

For sample styles, see:

• userstyles.org
• Firefox Help: Tips & Tricks: Browser Appearance
• Category:Visual customizations (Firefox)

Moving and copying

You can move or copy userChrome.css to a different profile. If it imports or references other files such as images, then you must also move or copy these other files. To make the changes take effect, you must restart the application.

Deleting

You can delete userChrome.css to get rid of any user styles defined there. To make the change take effect, you must restart the application.

Troubleshooting

For some information about common problems, see: Editing configuration – Troubleshooting

Related files and folders

• userChrome-example.css
• userContent.css
• userContent-example.css

See also

• Chrome element names and IDs
• Editing configuration

External links

• The ChromEdit extension provides a convenient way of editing userChrome.css and other configuration files.
• The Stylish extension provides another way to change styles in web pages and e-mails. It does not use the file userContent.css, and changes take effect without restarting the application.