As it seems that MASTER_SITE_MOZILLA isn't hosting addons anymore, a new
variable MASTER_SITE_MOZILLA_ADDONS has been defined and set to
http://addons.cdn.mozilla.net/user-media/%SUBDIR%/
which unfortunately not browsable and AFAIK not mirrored.
I tried to keep the changes to the minimum and successfully (except for
adblock) tested the fetch target for XPIs not defining their own MASTER_SITE.


git-svn-id: svn+ssh://svn.freebsd.org/ports/head@374228 35697150-7ecd-e111-bb59-0022644237b5