Trying to install release versions of iceweasel failed

[Haselnuss87]

Hello,

I followed the instructions on http://mozilla.debian.net///for testing-> 
iceweasel -> release but still get the message "iceweasel is already the 
newest version." from apt-get running: "sudo apt-get install -t 
experimental iceweasel". apt-get update has been executed multiple times 
before that.

What am i doing wrong?
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