Windows 10 reached EOS (end of support) on October 14, 2025. If you are on Windows 10, see this article.

Avatar for Username

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.

കൂടുതലറിയുക
This thread was archived. Please ask a new question if you need help.
Archived

How to edit system theme?

Firefox Settings
TyDraniu replied 5 years ago
invctbehipwmohlyjq
invctbehipwmohlyjq

Hi!

I want to edit system theme for firefox. Where exactly is it stored on the disk?

Previously it is asked here: https://support.mozilla.org/en-US/questions/940165

But that answer does not reveal the exact file location.

For example if I want to tweak font used on browser tab or shadow color around browser tab what exactly do I have to edit?

PS I dont want simply to customize colors like themes you can find on the internet do. I want to customize entire html/css that is used in FF UI.

Hi! I want to edit system theme for firefox. Where exactly is it stored on the disk? Previously it is asked here: https://support.mozilla.org/en-US/questions/940165 But that answer does not reveal the exact file location. For example if I want to tweak font used on browser tab or shadow color around browser tab what exactly do I have to edit? PS I dont want simply to customize colors like themes you can find on the internet do. I want to customize entire html/css that is used in FF UI.

എല്ലാ മറുപടികളും (1)

TyDraniu
TyDraniu
  • Top 25 Contributor

Everything is explained here: https://www.reddit.com/r/FirefoxCSS/comments/73dvty/tutorial_how_to_create_and_livedebug_userchromecss/