WebRequest Rules — sycxyc

Full control of the WebRequest API by coding it yourself.

Main Features:
* Cancel requests
* Redirect requests
* Upgrading to a secure request
* Supply authentication credentials
* Modify request headers (user-agent, x-forwarded-for, referer, cookie...)
* Modify response headers (access-control-allow-*, content-security-policy, x-frame-options...)
* Modify response body
* Read request body
* Adjustable rule priority
* Rules grouping
* Complex conditions available
* Customizable templates
* Support for asyncBlocking
* Import/Export settings

This extension is open source and you can file bug reports on the GitHub issue.

Notes:
* Optional permissions need to be enabled manually only if you want to write functionality that relies on these APIs.
* The optional Code Editor feature is provided by the Code Editor extension.

References:
* https://developer.mozilla.org/docs/Mozilla/Add-ons/WebExtensions/API/webRequest