ports/162448: www/xpi-clear_cache_button: make it working with firefox in ports

[edwin at FreeBSD.org]

Synopsis: www/xpi-clear_cache_button: make it working with firefox in ports

Responsible-Changed-From-To: freebsd-ports-bugs->miwi
Responsible-Changed-By: edwin
Responsible-Changed-When: Thu Nov 10 23:10:18 UTC 2011
Responsible-Changed-Why: 
miwi@ wants this port PRs (via the GNATS Auto Assign Tool)

http://www.freebsd.org/cgi/query-pr.cgi?pr=162448