CSS Override

Name: CSS Override
Rating: 4.2143 (28 reviews)
Author: swcolegrove

By: swcolegrove

Add your own custom CSS styles to any webpage

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Features & Capabilities

CSS Override is a powerful Chrome extension that lets you add your own custom CSS styles to any webpage, enhancing your browsing experience by personalizing look and feel. Easily toggle your custom styling on or off with the extension icon and use the built-in style editor to apply your CSS rules. This open-source tool offers a trustworthy alternative to other styling extensions, focusing on privacy and control. Perfect for users who want to fix or beautify web pages according to their preferences without compromising security.

User Growth & Download Statistics

Add-on Developer Tools Design Privacy & Security

By:

Daily users:

Rating:

Version:

1.0 Last updated: 2019-10-08

Version code:

4875363

Creation date:

2019-10-07

Risk:

Permissions:

Size:

20.02KB

Full description:

Source:

Firefox Add-ons Store

Data ingested on:

2026-06-15

Compare stats and ranking:

Ranking

# 2,120 ▼ 1

Other rankings

#176 in Tabs

#339 in Appearance ▼ 3

#2 in override keyword 11

#5 in overdrive keyword 6 ▲ 1

#26 in cover keyword 10 ▲ 1

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For Developers

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Contact the developer

Chrome-Stats does not own this Firefox add-on. Please use these information below to contact the Firefox add-on developer.

Developed by:

swcolegrove

Firefox Add-ons Store

https://addons.mozilla.org/firefox/addon/css-override/

User Reviews

Most reviews praise CSS Override for being simple, fast, and effective for site-specific CSS tweaks (including font changes) and for centralizing overrides. However, there are notable downsides: inconsistent site reliability, YouTube-related quirks, injection timing delays, and a confusing editor with a need for better guidance. Overall it’s useful for straightforward CSS work, but reliability and editor usability could be improved.

Pros

Works as advertised and generally reliable across many sites.
Simple, fast, and easy to use (KISS) with a minimal interface.
Useful for precise, site-specific CSS overrides and for centralized management of your overrides.
Helpful for typography tweaks and font changes on pages.
Does what it says on the tin and provides quick feedback for straightforward CSS work.

Cons

Inconsistent availability: reported as not working on several sites and some users say it stopped working recently.
YouTube-specific issues: autoplay can be affected and layout tweaks may behave inconsistently.
CSS injection timing: changes are applied too late, after the page has loaded.
Editor UX and guidance gaps: confusing blank editor, lack of hints/manual, requests for a linter or better styling tools.
Hard to manage overrides across many sites: lack of a clear overview or centralized management for all site-specific rules.

Recent reviews

Does not work. You can add CSS code that is then ignored.

by da*****, 2026-02-09

Works decent, but there seems to be issue with YouTube in particular - it stops autoplaying videos for some reason.

by Ag*****, 2025-05-23

by Fi*****, 2025-05-15

View all user reviews ›

Is CSS Override Safe?

Risk impact

Risk impact measures the level of extra permissions an extension has access to. A low risk impact extension cannot do much harms, whereas a high risk impact extension can do a lot of damage like stealing your password, bypassing your security settings, and accessing your personal data. High risk impact extensions are not necessarily malicious. However, if they do turn malicious, they can be very harmful.

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

Risk impact analysis details

Critical Grants access to browser tabs, which can be used to track user browsing habits and history, presenting a privacy concern.
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Risk likelihood

Risk likelihood measures the probability that a Firefox add-on may turn malicious. This is determined by the publisher and the Firefox add-on reputation on Firefox Add-ons Store, the amount of time the Firefox add-on has been around, and other signals about the Firefox add-on. Our algorithms are not perfect, and are subject to change as we discover new ways to detect malicious extensions. We recommend that you always exercise caution when installing a Firefox add-on.

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

Risk likelihood analysis details

High This extension has low user count. Unpopular extensions may not be stable or safe.
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