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Top 23 CSS Userchrome Projects
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Project mention: Ask HN: Which web browser are you using and why? | news.ycombinator.com | 2025-12-03
Most chromium-based browsers feel the same and its disappointing. If I wasn't as happy with the gnome skin for firefox I'd probably be using Zen [1] because its nice to see a firefox based browser that tries to introduce new features and create an identity of its own instead of joining a size measuring contest on how hard(ened) they are (I respect them, but it's a very saturated market at this point).
[1]: https://github.com/rafaelmardojai/firefox-gnome-theme
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ArcWTF
A userChrome.css theme to bring Arc Browser look on Windows to Firefox. Work with Windows, Linux and macOS ✨
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I use this userchrome.css to replicate some of the zen UI in vanilla firefox: https://github.com/akkva/gwfox
UI isn't the only thing zen does, but anything else I just adjusted myself + some custom uBlock Origin filters and I'm good to go.
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fluentbird
FluentBird is a userChrome.css theme for Mozilla Thunderbird, that implemenets Windows 11 Fluent Design and Mica transparency materials.
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Project mention: Making Firefox's right-click not suck with about:config | news.ycombinator.com | 2026-03-04
Also, there's a nice little toolkit for removing items from all the Firefox right-click menus: https://github.com/stonecrusher/simpleMenuWizard.
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elementaryos-firefox-theme
This theme for Firefox supports all the window buttons layouts from Tweaks and it blends into the elementary OS user interface.
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slick-fox
:fox_face: A firefox config that has rounded tabs and a url bar that can disappear when not selected on. It works with any theme.
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Project mention: Mozilla is working on a big Firefox redesign, here is what it looks like | news.ycombinator.com | 2026-03-06
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Sweet-Pop
Sweet_Pop! Beautify, Customize Firefox. Minimalist animated oneliner theme for Firefox perfectly matching Sweet Dark.
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Edge-Mimicry-Tree-Style-Tab-For-Firefox
A theme for Tree Style Tab that tries to replicate the vertical tab feature of Microsoft Edge Browser
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NOTE:
The open source projects on this list are ordered by number of github stars.
The number of mentions indicates repo mentiontions in the last 12 Months or
since we started tracking (Dec 2020).
CSS Userchrome discussion
CSS Userchrome related posts
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Making Firefox's right-click not suck with about:config
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Why I'm all-in on Zen Browser
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Add Water – Keep Firefox in Fashion
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Firefox Proton UI userChrome.css fixes. (2021)
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How do i fix this?
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Firefox Keeps Getting Faster
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help with css
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A note from our sponsor - SaaSHub
www.saashub.com | 8 Jun 2026
Index
What are some of the best open-source Userchrome projects in CSS? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | firefox-gnome-theme | 3,872 |
| 2 | CustomCSSforFx | 2,057 |
| 3 | MaterialFox | 1,972 |
| 4 | ArcWTF | 1,731 |
| 5 | Firefox-Mod-Blur | 1,699 |
| 6 | WaveFox | 1,233 |
| 7 | gwfox | 862 |
| 8 | fluentbird | 608 |
| 9 | simpleMenuWizard | 485 |
| 10 | Firefox-UWP-Style | 453 |
| 11 | elementaryos-firefox-theme | 441 |
| 12 | FirefoxCSS | 379 |
| 13 | slick-fox | 378 |
| 14 | shimmer | 362 |
| 15 | waterfall | 274 |
| 16 | Sweet-Pop | 264 |
| 17 | firefox-qutebrowser-userchrome | 203 |
| 18 | firefox-i3wm-theme | 164 |
| 19 | zapsCoolPhotonTheme | 146 |
| 20 | FirefoxW10ContextMenus | 113 |
| 21 | Edge-Mimicry-Tree-Style-Tab-For-Firefox | 109 |
| 22 | firefox-minima | 103 |
| 23 | rounded-fox | 94 |
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