I will show you a trick by which you can make your “IceWeasel” appear as “FireFox” to websites like Alexa. More here
For those of you who have been using Debian Linux, you probably already know that the famous “Firefox” browser is called “IceWeasel” in Debian because of some licensing issues. There is nothing wrong with “IceWeasel” as only the name is changed. However there are some websites which will offer you different functionality based on the type of browser that you are using.