[issue2551088] Add norefererer to link representation

New submission from John Rouillard:

See: https://html.spec.whatwg.org/multipage/links.html#link-type-
noreferrer

We already use:

  nofollow noopener

for links to reduce the utility of spamming a tracker (nofollow) and
prevent a link opened from a tracker from interacting with the tracker
via the opener handle. Adding noreferrer implements noopener for IE
and also prevents the referer (sic) header from being sent to the
server for the link.

So this is an incremental improvement to what we have.

I don't like loosing the referer header as that could be useful to the
destination web site. But IE won't die.

This is as easy as finding all instances of noopener and adding 
noreferrer.

----------
components: Web interface
keywords: Effort-Low
messages: 6941
nosy: rouilj
severity: normal
status: new
title: Add norefererer to link representation
type: security
versions: devel

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