Cannot open html file in Firefox. Need help

I can open any html file in my G5 without any trouble. Now that I am setting up my new i7, while I can open the html files using Safari, the html files will not open using Firefox. I have tried "Open With....", but it will not open. My default browser presently is Firefox which is what I want for now. I was given a script that can be inserted through the terminal, but I don't know if it would work. I would rather see is anyone has had this experience and how they solved it.
I have reinstalled Firefox with no success with the html files.
Thanks
Message was edited by: Herschel Hochman

Out of curiosity, I used the latest Firefox 3.6 to open a webarchive file. The Firefox "Open File" requestor allows you to tell it to use Firefox to open the file, but it doesn't open it. Doesn't give any error. When I go through Finder, and double-click the file, it opens in Safari. When I use "Open with" in Finder itself to tell it to use Firefox, Firefox is greyed out as an application.
Interesting. Sorry couldn't solve for you. But it may point to a shortcoming in Firefox.

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