This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

Firefox Custom theme

  • 2 cavab
  • 0 have this problem
  • 2 views
  • Last reply by Terry

more options

how do i start creating my own custom theme using css? im not looking to just change a color, i want more control of the whole firefox browser. any links for good tutorials? all ive found was tutorials on how to install custom themes but none on how to make them using css. <3

how do i start creating my own custom theme using css? im not looking to just change a color, i want more control of the whole firefox browser. any links for good tutorials? all ive found was tutorials on how to install custom themes but none on how to make them using css. <3

All Replies (2)

more options

WARNING from the moderator team: userChrome.css scripts are not provided by Mozilla and is not officially supported. Firefox is a work in progress and, to allow for continuous innovation, Mozilla cannot guarantee future updates won’t impact your customizations. For this reason, Mozilla does not officially support style rules customization.

Please read Firefox Advanced Customization and Configuration Options to learn more.

If you want to make a custom theme, I recommend that you head to https://color.firefox.com/

more options

Here are some links. I have added a blank space to each of the external links so you will have to remove those.

https://www.userchrome. org/how-create-userchrome-css.html (see various pages on that site) https://www.reddit. com/r/FirefoxCSS/wiki/index/tutorials https://developer.mozilla.org/en-US/docs/Tools https://developer.mozilla.org/en-US/docs/Web/CSS https://developer.mozilla.org/en-US/docs/Tools/Browser_Toolbox https://developer.mozilla.org/docs/Web/CSS/CSS_Selectors