Open Synaptic, click on Iceweasel, choose Mark for Complete Removal, apply.
Download Firefox from mozilla.com
Unzip and run.
2 minutes, problem solved.
Or you can just have both versions installed, as I would imagine they would do so in different directories. It wouldn't make much sense for SporkWeasel to be installed in the "firefox" directory. I've got both Firefox 1.5.0.7 and firefox 2.0 rc2 installed. Which one gets called is determined by a symlink.
That pic is great! LOL