Hi Marc,

firefox is not in jessie-backports, but in unstable. The package which you may 
find there in the future is firefox-esr, which is in testing atm. For 
desktop-installations it's IMO better to just run testing or unstable if you're 
somewhat knowledgeable. You know, they say there are three flavors of debian: 
rusty, stale and broken. Probably should add a fourth fossilized flavor ;)

> I have updated my /etc/apt/sources.list file and installed both 
> pkg-mozilla-archive-keyring and debian-keyring.
so you installed from mozilla repo before and you certainly had the debian repo 
- what did you have to change?
Also: how did you attempt to install the keyrings? check: dpkg -l 
${packagename} - ii in front for installed
If they're not installed, obtain the keyring deb via HTTPS and install: dpkg -i 
{packagename} (HTTPS because you cannot verify keyring integrity without 
trusting the keyring in the first place, default-HTTPS does not give you the 
same guarantees as secure-apt but at least an attacker has to acquire a validly 
signed cert.)

regards, Arian

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