CSS Override

Add your own custom CSS styles to any webpage

CSS Override: Custom CSS styles for webpages

'CSS Override' is a Firefox add-on that allows users to add custom CSS to any webpage. Used by toggling on/off or opening up the style editor for the current site. Once custom CSS is inputted and saved, it is implemented when custom styles are toggled on for the page. Perfect for users seeking a trustworthy, open-source alternative to Stylelish.
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View on Firefox Browser Add-ons

Add-on stats

Users: 2,041
13
Rating: 4.29
(24)
0.03
Version: 1.0 (Last updated: 2019-10-08)
Creation date: 2019-10-07
Weekly download count: 60
Firefox on Android: No
Risk impact: High risk impact
Risk likelihood:
Low risk likelihood
Manifest version: 2
Permissions:
  • activeTab
  • tabs
  • storage
  • <all_urls>
Size: 20.50K

Ranking

# 2,032 ▲ 14
Other rankings
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Other platforms

Not available on Chrome
Not available on Android
Not available on Edge
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Add-on summary

Analyze keywords

Tired of blindingly white web pages?

This extension allows you to add your own custom css styles to any webpage. Hit the extension icon to toggle custom styling on/ off or to open up the style editor for the site you are currently on.

Paste your custom CSS into the style editor and hit save. When you toggle custom styles on for the page your custom css should now be shown.

I made this extension after Stylish got caught doing some shady stuff and wanted to use something I could trust. This project is open source on github (see link in sidebar).

User reviews

These summaries are automatically generated weekly using AI based on recent user reviews. Firefox Browser Add-ons does not verify user reviews, so some user reviews may be inaccurate, spammy, or outdated.
Pros
  • Works as advertised
  • Simple and fast to use
  • Allows specific CSS changes per site
  • Effective for overriding styles like video layouts
Cons
  • Does not work on certain websites
  • Lack of an overview or easy access to site CSS setups
  • No manual or hints for new users
  • Stopped working for most sites recently
Most mentioned
  • Functionality to apply specific CSS rules to web pages
  • Issues with compatibility across different websites
  • Desire for improved documentation or guidance for new users
User reviews
Works as advertised. It's not only useful for fixing bad css, but also for websites that let you customise your css but lack a preview button.
by crackle, 2025-01-27
Works as advertise, I think 1,2,3 starts are just skill issue.
by pbogut, 2025-01-18
¡SÚPER limpia e intuitiva... me gusta cambiar la letra de las páginas, pero necesitaba un cambio específico no universal en la configuración del navegador. // LA PANACEA: * {font-family: Fira Mono;} MIL GRACIAS!
by Colchón Amarrado, 2024-12-24
View all user reviews

Add-on safety

Risk impact

CSS Override requires some sensitive permissions that could impact your browser and data security. Exercise caution before installing.

Risk likelihood

CSS Override has earned a fairly good reputation and likely can be trusted.

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