>I can see where one first has to find out if Firefox is installed and is the default browser before doing anything. Then one has to find the current user and then get the path to that user's folder and then navigate to the Firefox directory such as "C:\Documents and Settings\John Smith\Application Data\Mozilla\Firefox\Profiles\default.84w" and then add the cookie to the cookie.txt file.
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>I'll let everyone know if I get around to putting the pieces together to do this in one simple function.

And then the webpage can be marked as "open in IETab" in IETab plugin, so you may still need to do it for IE as well. Your best bet is to just cram it into both places, just in case.