CSS Userchrome

Open-source CSS projects categorized as Userchrome | Edit details

Top 19 CSS Userchrome Projects

  • GitHub repo MaterialFox

    A Material Design-inspired userChrome.css theme for Firefox

    Project mention: Meow | reddit.com/r/196 | 2021-10-14

    Once you've done that, install this stylesheet: https://github.com/muckSponge/MaterialFox

  • GitHub repo CustomCSSforFx

    Custom CSS tweaks for Firefox

    Project mention: Mozilla has defeated Microsoft’s default browser protections in Windows | reddit.com/r/Windows11 | 2021-09-13

    Personally I've been sticking with some old things since way back when using https://github.com/Aris-t2/CustomCSSforFx and my own tweaks. Here's a sample of modifications I did before updating the main browser since nightly can be installed separately. https://i.imgur.com/MtpHLtc.png

  • Nanos

    Run Linux Software Faster and Safer than Linux with Unikernels.

  • GitHub repo FlyingFox

    An opinionated set of configurations for firefox.

    Project mention: High CPU load | reddit.com/r/FirefoxCSS | 2021-10-10

    Finally got working FlyingFox theme , the only problem is the cpu load.

  • GitHub repo SimpleFox

    🦊 A Userstyle theme for Firefox minimalist and Keyboard centered.

    Project mention: https://np.reddit.com/r/FirefoxCSS/comments/pkekv6/cascade_a_responsive_oneline_theme_based_on/hc2w1nt/ | reddit.com/r/backtickbot | 2021-09-08

    Cascade is a Firefox Theme based on SimpleFox. This theme was known previously as "ag.proton"—but let's be honest: That sounds hella boring. What you get is a really simple one-line layout that works well with the new Proton UI.

  • GitHub repo Quantum-Nox-Firefox-Dark-Full-Theme

    A customizable full dark theme for Firefox. You can also add extra functions using the CSS and JS files here apart from the theme.

    Project mention: Firefox 89 Proton Feedback Megathread | reddit.com/r/firefox | 2021-06-04

    As for the rest of the UI I mainly relied on CustomCSSforFx by Aris-t2: https://github.com/Aris-t2/CustomCSSforFx a bit of CSS from Quantum-Nox-Firefox-Dark-Full-Theme: https://github.com/Izheil/Quantum-Nox-Firefox-Dark-Full-Theme by Izheil and some CSS that I liked.

  • GitHub repo elementaryos-firefox-theme

    This theme for Firefox supports all the window buttons layouts from Tweaks and it blends into the elementary OS user interface.

    Project mention: love Elementary 6 Odin! i am use this daily driver since release out! | reddit.com/r/elementaryos | 2021-09-07

    You can try this Firefox theme for a better integration :)

  • GitHub repo 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.

    Project mention: How can I remove this gap between tabs and the top of the window on 89 (Proton) ? | reddit.com/r/FirefoxCSS | 2021-06-23

    There kinda is, but not like that. slick-fox seems to add a 6px top margin for tabs here - make that 0 or 0px and it should remove the space.

  • Scout APM

    Scout APM: A developer's best friend. Try free for 14-days. Scout APM uses tracing logic that ties bottlenecks to source code so you know the exact line of code causing performance issues and can get back to building a great product faster.

  • GitHub repo simpleMenuWizard

    Hide contextmenu items in Firefox Photon

    Project mention: Make App Menu taller | reddit.com/r/FirefoxCSS | 2021-09-12

    Hello, I'm using this script to remove some unneeded items from the App Menu & More Tools menus.

  • GitHub repo Firefox-UWP-Style

    MDL2 + Sun Valley Theme for Firefox

    Project mention: Firefox Sun Valley Style (Beta) | reddit.com/r/FirefoxCSS | 2021-09-16

    Download Github

  • GitHub repo FirefoxW10ContextMenus

    Emulates the Windows 10 context menus in Firefox.

    Project mention: Does this code still work on firefox 93? | reddit.com/r/FirefoxCSS | 2021-10-13
  • GitHub repo cascade

    Firefox custom CSS based on Simplefox (by andreasgrafen)

    Project mention: https://np.reddit.com/r/FirefoxCSS/comments/pkekv6/cascade_a_responsive_oneline_theme_based_on/hc2w1nt/ | reddit.com/r/backtickbot | 2021-09-08

    Repo: https://github.com/andreasgrafen/cascade

  • GitHub repo ff-ultra-compact-mode

    A Compact Mode for Firefox Proton

    Project mention: FF93.0 update has broken Compact Density | reddit.com/r/firefox | 2021-10-10

    I see your point. In case if you wanted the compact mode more even compact like i am for my laptop screen, there's this css to solve it: https://github.com/dannycolin/fx-compact-mode

  • GitHub repo Remove-Firefox-Megabar

    Remove the new Firefox Megabar using CSS

    Project mention: Firefox Tabs on Bottom of address bar! | reddit.com/r/firefox | 2021-04-22

    Have my CSS (using it in 84, probably breaks in proton of course). Depends on this CSS file for the 'megabar'.

  • GitHub repo Safari-Theme-for-Firefox

    Make Firefox look more native on macOS. Light Mode / Dark Mode.

    Project mention: Safori with minor changes, works great on Proton! | reddit.com/r/FirefoxCSS | 2021-06-03

    Based on https://github.com/diedummydie/Safari-Theme-for-Firefox and https://github.com/floriandierickx/Safari-Theme-for-Firefox

  • GitHub repo Sweet-Pop

    Sweet_Pop! Beautify, Customize Firefox. Minimalist oneliner theme for Firefox perfectly matching Sweet Dark.

    Project mention: Hey guys! Can something like this be made with CSS? Thanks! | reddit.com/r/FirefoxCSS | 2021-08-31

    This one has a similar style

  • GitHub repo rainfox

    It's like Photon, but better.

    Project mention: Firefox 89 - where are my tabs? | reddit.com/r/firefox | 2021-06-09
  • GitHub repo Firefox_Custom_CSS

    Firefox CSS theme to maximize the vertical space of your monitor.

    Project mention: I Love Firefox | reddit.com/r/FirefoxCSS | 2021-08-18

    Thanks to https://github.com/hakan-demirli/Firefox_Custom_CSS

  • GitHub repo Quietfox-Proton

    Quietfox release for Proton, upgrades and improvments from myself, and from the Lepton project

    Project mention: I too updated Quietfox to 89, here's my take | reddit.com/r/FirefoxCSS | 2021-06-06
  • GitHub repo Firefox-Browser-Proton-Custom

    A custom userChrome.css for Firefox 86+ (February 2021). For personal purpose only.

    Project mention: I really hope the "playing" indicator is reversed to how it looked before proton. It looks awful at the moment. | reddit.com/r/firefox | 2021-02-21

    Sample CSS for Proton

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). The latest post mention was on 2021-10-14.


What are some of the best open-source Userchrome projects in CSS? This list will help you:

Project Stars
1 MaterialFox 1,666
2 CustomCSSforFx 1,346
3 FlyingFox 1,103
4 SimpleFox 964
5 Quantum-Nox-Firefox-Dark-Full-Theme 360
6 elementaryos-firefox-theme 340
7 slick-fox 252
8 simpleMenuWizard 210
9 Firefox-UWP-Style 126
10 FirefoxW10ContextMenus 103
11 cascade 94
12 ff-ultra-compact-mode 79
13 Remove-Firefox-Megabar 65
14 Safari-Theme-for-Firefox 57
15 Sweet-Pop 31
16 rainfox 18
17 Firefox_Custom_CSS 7
18 Quietfox-Proton 6
19 Firefox-Browser-Proton-Custom 5
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