What is Iceweasel?
Mozilla Firefox rebranded by the 
Debian project. It can run all Firefox add-ons and plugins.In 2006, a branding issue developed when Mike Connor, representing the Mozilla Corporation, requested that the Debian Project comply with Mozilla standards for use of the Thunderbird trademark when redistributing the Thunderbird software. At issue were modifications not approved by the Mozilla Foundation, when the name for the software remained the same.
In 2006 the Debian Project subsequently rebranded the Mozilla Firefox program, and other software released by Mozilla, so that Debian could continue to distribute the software with modifications permitted, without being bound by the use of trademark requirements that the Mozilla Foundation had required. The new names established by Debian were Iceweasel for Mozilla Firefox, Icedove for Mozilla Thunderbird, and Iceape for SeaMonkey. These changes were implemented in the subsequent version of Debian (Etch). In July 2007, Iceowl, a rebranded version of Mozilla Sunbird, was added to the unstable branch of Debian.
Discontinued
As of 9th of June, 2016 Firefox replaces Iceweasel in Debian Wheezy and Jessie security repositories. Firefox is now in Debian again with the official name and branding. https://lwn.net/Articles/676799/
Recent user activities on Iceweasel
- mikwee doesn't think Google Chrome is an alternative to Iceweasel
- smaragdus liked Iceweaselsm
- ndas1 doesn't think Safari is an alternative to Iceweasel
Sad to seen that this has mothballed. It was better (safer) than firefox, especially the latest edition. Look to Waterfox instead.
It just looks and feels as good old Firefox, but it has a cool name.
Nothing to complain about, my default browser.