# CSS Override

> Add your own custom CSS styles to any webpage

Canonical page: [https://chrome-stats.com/d/css-override](https://chrome-stats.com/d/css-override)

## Overview

- **ID:** `css-override`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** swcolegrove
- **Category:** appearance,tabs
- **Daily users:** 2,003
- **Weekly downloads:** 26
- **Rating:** 4.21 / 5 (28 ratings)
- **Version:** 1.0
- **Last updated:** 2019-10-08
- **First published:** 2019-10-07
- **Size:** 20 KB
- **Data as of:** 2026-09-05
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/css-override/)

## Description

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.

## Rankings

- #2,173 — Overall
- #183 — Tabs
- #350 — Appearance
- #2 — override
- #6 — overdrive
- #26 — cover

## Permissions and access

### Permissions

- `activeTab`
- `tabs`
- `storage`
- `<all_urls>`

## Safety

- **Risk impact:** High risk impact
- **Risk likelihood:** Low risk likelihood

### Analysis details

- Grants access to browser tabs, which can be used to track user browsing habits and history, presenting a privacy concern.
- This extension has low user count. Unpopular extensions may not be stable or safe.

> Some risk analysis details are omitted from this free response. [Upgrade to view the full analysis](https://chrome-stats.com/pricing).

## Review summary

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.

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Source: [Chrome-Stats](https://chrome-stats.com/d/css-override)