How does Firebug process HTTP headers?

[Thorsten]

Hello,

as mentioned in the subject, I am wondering how Firebug deals with
HTTP headers? Specifically, does it hook into Firefox or use
Javascript? I'm looking into using the Accept-Language header for a
translation jetpack which appears to be more generic and cross-browser
than "navigator.language" which returns the UI language.

I searched the web for how to do it with pure Javascript, but came up
empty so far. Then I noticed Firebug's functionality.

A short reply would be nice

[Honza (Jan Odvarko)]

Firebug uses techniques (events) described here:
https://developer.mozilla.org/en/Setting_HTTP_request_headers

Honza