MozillaZine

UserChrome.css

From MozillaZine Knowledge Base

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.

Contents

Creating

To create this file, use your operating system tools.

Go to your profile folder. Then go to the chrome folder there, creating it if necessary. In the chrome folder, create a plain text file named userChrome.css.

Notes: 

  • If you have more than one profile, then each of your profiles has a separate userChrome.css file.
  • There is another chrome folder where Thunderbird's code is installed. Do not create a userChrome.css file there—it will not work.

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 Mini Tutorial (old) see Section 4 here -

[1]

For sample styles, see:

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

See also

External links