# Accept Header Override

> This extension overrides the default 'Accept' header to prevent websites from serving lossy WebP images instead of the original PNG/JPG

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

## Overview

- **ID:** `accept-header-override`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** Cake
- **Category:** web-development,download-management,photos-music-videos
- **Daily users:** 2
- **Rating:** 3.00 / 5 (1 ratings)
- **Version:** 1.0
- **Last updated:** 2024-10-11
- **First published:** 2024-10-09
- **Size:** 8.10 KB
- **Data as of:** 2026-09-10
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/accept-header-override/)
- **Website:** [https://github.com/cakeneko/accept-header-extension/issues](https://github.com/cakeneko/accept-header-extension/issues)

## Description

Please note that this Add-on will only work on websites that use the Accept header to detect WEBP compatibility. It will not work on websites that always serve this format or that use other means, such as User Agent, to detect compatibility.

This add-on doesn't execute any JavaScript because it uses the declarativeNetRequest API from manifest v3. Check the &lt;a href=<a href="https://prod.outgoing.prod.webservices.mozgcp.net/v1/6ca81094f09fb779197e074fef7f96b2d79820d1b647417c9f69e3de7a9c59a8/https%3A//github.com/cakemiau/accept-header-extension/blob/main/src/rules-firefox.json" rel="nofollow">https://github.com/cakemiau/accept-header-extension/blob/main/src/rules-firefox.json</a>&gt;source code&lt;/a&gt; for more information.

## Rankings

- #62,565 — Overall
- #21 — override
- #42 — overdrive
- #169 — header

## Permissions and access

### Permissions

- `declarativeNetRequest`

### Host permissions

- `<all_urls>`

## Safety

- **Risk impact:** Moderate risk impact
- **Risk likelihood:** Moderate risk likelihood

### Analysis details

- Allows access to all websites, posing a significant security risk as it can monitor and modify data from any visited site.
- 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).

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