Unable to find expected entry 'firefox-release/binary-amd64/Packages' in Release file

[Mikhail Strakhov]

Hi,
I previously install firefox 'release' on Debian Jessie
(3.16.0-4-amd64 #1 SMP Debian 3.16.39-1+deb8u1 (2017-02-22) x86_64
GNU/Linux) by apt-get from your http://mozilla.debian.net/

But now I'm getting:

W: Failed to fetch
http://mozilla.debian.net/dists/jessie-backports/Release  Unable to
find expected entry 'firefox-release/binary-amd64/Packages' in Release
file (Wrong sources.list entry or malformed file)

Are still maintaining firefox-release packages and if yes, what should
I put in /etc/apt/sources.list now?

Thank you !