If you add the Mozilla repository in debian Testing (mozilla.debian.net) you may get an error like this when updating with APT:
W: GPG error: http://mozilla.debian.net experimental Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 85A3D26506C4AE2A
To solve this problem you need to install the debian-keyring first
# apt-get install debian-keyring
then run these 2 commands:
# gpg --keyserver keys.gnupg.net --recv-key 06C4AE2A
# gpg -a --export 06C4AE2A | apt-key add -
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