Iceweasel is a fork [from Firefox] with the following purpose :

  1. backporting of security fixes to declared [:DebianStable:Debian stable] version.

  2. no inclusion of trademarked Mozilla artwork (because of #1 above)

Beyond that, they will be basically identical. (quoting Roberto C. Sanchez post in [http://lists.debian.org/debian-devel/2006/10/msg00665.html debian-devel] mailing list)

Also note that iceweasel is NOT Iceweasel from [http://www.gnu.org/software/gnuzilla/].

Invoke it using one of this ways:



or simply


For ["Gnome"] launcher, use

 /usr/lib/iceweasel/iceweasel "%s"

to open a concrete page.

How to install Iceweasel (Firefox)

To install Iceweasel, simply do:

aptitude install iceweasel   #(it provides mozilla-firefox)

GNOME users might also want to install GNOME support:

aptitude install iceweasel-gnome-support

Native language versions are also available.


The plugin directory is

for more info on iceweasel plugins, refer to the plugins section of the ["Mozilla"] page.

It has Javascript enabled by default.

User Agent String

IceWeasel's user agent string (on DebianTesting, at the time of writing... ) is : Mozilla/5.0 (X11; U; Linux i686; en-US; rv: Gecko/20080129 Iceweasel/ (Debian-

Some application are checking the browser's user agent string, which prevent you from accessing the site. You can change the user agent string manually or with the User Agent Switcher plugin.

To change the user agent string manually so that your browser is identified as 'Firefox' instead of 'Iceweasel'. Do the following.

You can use the [https://addons.mozilla.org/en-US/firefox/addon/59 User Agent Switcher] plugin, then download a UA profile :

[http://www.geticeweasel.org/useragent/ geticeweasel.org] has more information on Iceweasel user agent string.

SSL / Secure Connection warning

The message :

Can be disabled. see : http://changetheworldwithyourpassion.blogspot.com/2008/07/turn-off-secure-connection-failed-in.html


  1. My iceweasel is consistently crashing on a website
  2. First run iceweasel without loading any extensions and see if the problem persists. This can be done by using the -safe-mode option

    iceweasel -safe-mode

    mv ~/.mozilla/iceweasel ~/old_iceweasel
    iceweasel &

Unsuported Browser Error

Useragent Change in Iceweasel





Iceweasel not firefox/

Now you can browse mlsni.net with no problems. Everything works just like it would in firefox.

Restart Firefox.

See also