Uploaded March 2023 | Updated September 2026, 2 weeks ago
Is the default Firefox theme not really doing it for you? Are none of the custom Firefox userChrome.css files others have created to your liking? In this video, I'm going to teach you how you can completely customize almost everything about Firefox using Firefox CSS. I'll show you how you can live-debug your custom theme, find CSS snippets you can use in your own theme, style pages inside your browser, and more in this video...
How to install custom Firefox themes: youtube.com/watch?v=0QVs1jVuA8c
Why I switched back to Firefox: youtube.com/watch?v=w0SJFED5xK0
How to make Firefox more private and secure: youtube.com/watch?v=Fr8UFJzpNls
Firefox CSS Hacks Repo: github.com/MrOtherGuy/firefox-csshacks
Firefox CSS Subreddit: old.reddit.com/r/FirefoxCSS
My Firefox theme: github.com/EricMurphyxyz/userChrome.css
🌐 My website: https://ericmurphy.xyz
💸 Support the Channel: https://ericmurphy.xyz/donate
🎥 Watch my videos on Odysee: odysee.com/@ericnmurphy
💻 My GitHub: github.com/ericmurphyxyz
0:00 Intro
0:54 Steal someone else's theme
1:21 Enabling themes (if you haven't already)
1:36 Finding your profile folder
1:51 Enabling live-debugging
3:06 Editing files from the debugger
3:50 Finding browser elements with the inspector
5:45 Media queries
6:36 Changing CSS variables
7:38 Changing pages inside the browser with userContent.css
10:33 Firefox CSS snippets
12:44 Additional resources
13:08 Conclusion
Is the default Firefox theme not really doing it for you? Are none of the custom Firefox userChrome.css files others have created to your liking? In this video, I'm going to teach you how you can completely customize almost everything about Firefox using Firefox CSS. I'll show you how you can live-debug your custom theme, find CSS snippets you can use in your own theme, style pages inside your browser, and more in this video...
How to install custom Firefox themes: youtube.com/watch?v=0QVs1jVuA8c
Why I switched back to Firefox: youtube.com/watch?v=w0SJFED5xK0
How to make Firefox more private and secure: youtube.com/watch?v=Fr8UFJzpNls
Firefox CSS Hacks Repo: github.com/MrOtherGuy/firefox-csshacks
Firefox CSS Subreddit: old.reddit.com/r/FirefoxCSS
My Firefox theme: github.com/EricMurphyxyz/userChrome.css
🌐 My website: https://ericmurphy.xyz
💸 Support the Channel: https://ericmurphy.xyz/donate
🎥 Watch my videos on Odysee: odysee.com/@ericnmurphy
💻 My GitHub: github.com/ericmurphyxyz
0:00 Intro
0:54 Steal someone else's theme
1:21 Enabling themes (if you haven't already)
1:36 Finding your profile folder
1:51 Enabling live-debugging
3:06 Editing files from the debugger
3:50 Finding browser elements with the inspector
5:45 Media queries
6:36 Changing CSS variables
7:38 Changing pages inside the browser with userContent.css
10:33 Firefox CSS snippets
12:44 Additional resources
13:08 Conclusion
