r/FirefoxCSS

19K archived posts · Sep 2017 – Sep 2026

Firefox CSS

r/FirefoxCSS

Pushing the limits of the Firefox Browser through the use of CSS.

Created Sep 2, 2017

32KMembers (last snapshot)

19KArchived posts

Post must have flair!

Post must have flair. If your problem is solved, please change the flair to 'Solved'.
When Posting for Help or Code to Share.

For Help:

Post your code and/or the link to the theme you're using.

paste your code into a code block by preceding each line of code with four spaces

Or

copy your code, paste it at Pastebin, and post the link here

For code to share:

use pastebin or a Git Repo to share your code

do not post links to compressed files
Stay on topic.

Posts and comments should be about customizing the Firefox UI with CSS. Custom themes that include javascript or require installing a user script is not allowed.
Be civil.

Be civil. Bear in mind that many users come here for help and would be turned off by insults and rudeness.
No previews or advertising.

Don't post screenshots of CSS modifications or themes unless you also post the code or link to them.
Discussion is limited to the Firefox browser only.

Questions about modifying other browsers should be directed to their subreddits, e.g. r/Floorp, r/LibreWolf, etc.
Do not delete your post.

Don't delete your posts whether or not you got a solution. All posts are a valuable source for everyone to learn from one way or the other.

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