Just an FYI for those using iceweasel 35 from experimental. It went from 35.0.1 to 35.0.1-1. There's nothing exciting in the changelog, but, I upgraded, and, everything is working fine. apt-get -t experimental install iceweasel
cat /etc/apt/preferences.d/iceweaselPackage: iceweaselPin: release a=experimentalPin-Priority: 800
$ LC_MESSAGES=en_US apt-cache policy iceweaseliceweasel: Installed: 37.0~a2+20150116085230-1 Candidate: 37.0~a2+20150116085230-1 Version table: *** 37.0~a2+20150116085230-1 0 500 http://mozilla.debian.net/ experimental/iceweasel-aurora amd64 Packages 100 /var/lib/dpkg/status 35.0.1-1 0 1 http://http.debian.net/debian/ experimental/main amd64 Packages 31.4.0esr-1 0 500 http://http.debian.net/debian/ unstable/main amd64 Packages
...The "Aurora" build is up to six weeks behind "Nightly" and offers functionality that has undergone basic testing. As of version 35, the "Aurora" channel has been renamed to the "Developer Edition" channel.[55][56] The "Beta" channel is another six weeks away. It provides improved stability over the nightly builds and is the first development milestone that has the "Firefox" logo. "Release" is the current official version of Firefox....Test builds can be downloaded from the Firefox development channels: "Beta", "Developer Edition" (former Aurora) and "Nightly" (Central). As of January 13, 2015, Firefox 36 beta is in the "Beta" channel, Firefox 37 alpha is in the "Aurora" channel, and Firefox 38 pre-alpha is in the "Nightly" (Central) channel...
Aurora is a channel between the nightly builds from mozilla-central and beta versions from mozilla-beta; as such its status is roughly "experimental".