Mozilla (stylized as moz://a) is a free software community founded in 1998 by members of Netscape.
Modifying such headers is forbidden because the user agent retains full control over them. Names starting with
are reserved for creating new headers safe from APIs using Fetch that grant developers control over headers, such as
Forbidden header names start with
, or are one of the following names:
Note: Theheader is no longer forbidden, as per spec — see forbidden header name list (this was implemented in Firefox 43) — it can now be set in a Fetch Headers object, or via XHR setRequestHeader(). However, Chrome will silently drop the header from Fetch requests (see Chromium bug 571722).
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