# webRequest.onBeforeSendHeaders

> Requests to dyn.in are sent with HTTP header host set with correct www value. Example : - dyn.in.staging.example.com =\> www.staging.example.com ; - dyn.in.sub.pp.example.com =\> sub.pp.example.com.

Canonical page: [https://chrome-stats.com/d/webrequest-onbeforesendheaders](https://chrome-stats.com/d/webrequest-onbeforesendheaders)

## Overview

- **ID:** `webrequest-onbeforesendheaders`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** Firefox user 13682057
- **Category:** web-development,other
- **Daily users:** 1
- **Version:** 1.1resigned1
- **Last updated:** 2024-04-25
- **First published:** 2018-02-20
- **Size:** 8.41 KB
- **Data as of:** 2026-09-07
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/webrequest-onbeforesendheaders/)
- **Website:** [https://gitlab.com/chs/webRequest.onBeforeSendHeaders](https://gitlab.com/chs/webRequest.onBeforeSendHeaders)

## Description

webRequest.onBeforeSendHeaders is a Firefox add-on that allows you to modify HTTP headers before sending requests. It specifically helps in correcting the 'www' value in the host header for requests to dyn.in domains.

## Rankings

- #90,777 — Overall
- #40 — modheader

## Permissions and access

### Permissions

- `<all_urls>`
- `webRequest`
- `webRequestBlocking`

## 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/webrequest-onbeforesendheaders)