Trying to install a more recent Iceweasel on Wheezy

Thu Jan 24 20:34:15 UTC 2013

Hello,

As I run into websites complaining about that my browser no longer being 
supported, I'd like to upgrade to a more recent version of Iceweasel. 
However, the current version in experimental is uninstallable because of 
a missing libnss3 (>= 2:3.14) (only 2:3.13.6-2 is available.
How can this be fixed?

(please Cc: me as I am not subscribed to this list)