simple-modify-headers

The extension rewrite the headers based on a rules table.

It's possible to:

add , modify or delete header field for HTTP(S) request or response
export the configuration in a file (json format)
import the configuration from a file
choose urls on which the modifications applies

In order to work, the following extension permissions are needed :

storage : needed to store the configuration
activeTab, tabs : needed to show the configuration screen in the browser tab.
webRequest,webRequestBlocking, : needed to modify the headers

More information on https://github.com/didierfred/SimpleModifyHeaders

The code is opensource under Mozilla Public License 2.0