Enforce that the download, not update, URL is secure.
Enforce that the download, not update, URL is secure.

Fixes #1555

the8472/greasemonkey,HasClass0/greasemonkey,Ventero/greasemonkey,HasClass0/greasemonkey,Martii/greasemonkey,the8472/greasemonkey,Ventero/greasemonkey,Martii/greasemonkey