Debian Wheezy currently has version 31.3 (ESR) and will soon get 31.4 through stable-updates. Stable-security already has that version. In case you wonder what ESR is: https://www.mozilla.org/en-US/firefox/organizations/
Generally speaking, Debian stable always receives the last ESR versions these days, except at the end of an ESR cycle, where Mozilla actually releases two ESR versions. So, for instance, at the end of life of ESR 24, Mozilla released both 24.8 and 31.0, and Debian stable received 24.8. The next update was to 31.1.
I can understand nagging for very old versions, but Web sites nagging about current ESR versions are being rude.
If you are interested in fresher Iceweasel backports, check out http://mozilla.debian.net/.
And if you'd rather have the Firy logo instead of the icy one, and know how to build Debian packages, just download the Iceweasel sources, and build with the following environment variable set: PRODUCT_NAME=firefox.