Please describe the problem:
When I (middle-)clicked on "validate xhtml" link, I got this error message by
validator.w3.org

"""
No Referer header found!

You have requested we check the referring page, but your browser did not send
the HTTP "Referer" header field. This can be for several reasons, but most
commonly it is because your browser does not know about this header, has been
configured not to send one, or is behind a proxy or firewall that strips it out
of the request before it reaches us.

This is not an error in the referring page!
"""

But, when I just clicked it, epiphany opened a new window and the validation
results were shown

Steps to reproduce:
1. open http://srid.bsdnerds.org/sitedev/wiki/lifethings
2. middle-click on [w3c xhtml 1.0] footer image


Actual results:
NO HTTP referrer header was sent

Expected results:
HTTP referrer must be sent even if opened in new tabs

Does this happen every time?
Yes

Other information: