Reported [on the mailing list](https://mail1.eff.org/pipermail/https-everywhere/2012-December/001634.html): Starting with 4.0dev3, downloads of Firefox and Thunderbird fail from mozilla. Downloads come from download.cdn.mozilla.net and the Mozilla rule in https-everywhere results in the following error download.cdn.mozilla.net uses an invalid security certificate. The certificate is only valid for the following names: a248.e.akamai.net , *.akamaihd.net , *.akamaihd-staging.net