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Making moves
Status: New idea

Dear Mozilla Community Members,

We propose an innovative feature for the Firefox Add-ons Store: the CSS UI Section. This feature will provide users with a customizable interface experience akin to browser themes, but with greater flexibility and personalization.

Currently, the Firefox Add-ons Store offers users a wide array of browser extensions and themes. However, for users seeking to customize their browser interface, learning and applying CSS can be a daunting task. Therefore, we suggest introducing the CSS UI Section, allowing users to directly access and apply CSS files to customize their browser interface.


  1. Lowered Barrier to Entry: The CSS UI Section will significantly lower the barrier to entry for users looking to customize their browser interface. Instead of learning and editing the userChrome.css file, users can simply browse and apply CSS files they like from the store, making personalization effortless.

  2. Increased Choice: Introducing the CSS UI Section will offer users more choices, enriching their browser customization experience. Users can easily browse and compare different CSS files to find the interface style that suits them best.

  3. Community Engagement: This feature will also foster community engagement and contribution. Developers can create and share their own designed CSS files, enriching the store's selection and providing users with more inspiration and possibilities.

We believe that introducing the CSS UI Section will make Firefox customization simpler, more flexible, and more enjoyable. We look forward to hearing your feedback and suggestions to make Firefox an even more personalized browser!

People share their CSS files on these sites at present,and it's not for beginners, and it's hard for everyone to notice:




Thank you for your support!

Status changed to: New idea
Community Manager
Community Manager

Thanks for submitting an idea to the Mozilla Connect community! Your idea is now open to votes (aka kudos) and comments.

Making moves

I am used to installing Aris CSS Fixes for Firefox with every new Firefox install. It is essential for me. Anything that made this process easier would be welcome.

The above CSS Fixes that I use require editing a file to access all of the options. It would be easier to edit the options from within Firefox with "revert to previous state/Undo" or "revert to defaults" options when editing the CSS file.

Then if you (partially) borked your UI there is a chance that you could return back to a previous good version of the file.