Firefox won't open files (not links) in new tabs

Hello I'm having an issue with Firefox on my Mac Mini. I want to view html files I've edited in multiple tabs in ONE window. My problem is that whenever I double-click an html file it always opens them in a new window even when I have an existing window open. I have tried changing settings in the about:config in firefox to no avail. Is there some kind of setting I need to change in Leopard to fix this? I'm new to the Mac and have been using Windows for a long time. I recently got this Mac Mini and love it, but I can't figure out this one problem. I'm running Mac OS X 10.5.3 with Firefox 3 RC2. Here's the thing, I'm also running FF3RC2 on WinXP SP2 on my other machine and it does not have this problem at all. Any ideas? Thanks in advance for any help you guys can provide.

Can you download and launch Word files normally from other sites, such as: [http://download.microsoft.com/download/b/d/5/bd515214-0728-4a54-9625-ab3f198cf448/internetexplorer8.doc]
If so, it could be an issue on the mail provider's server. If the mail server is sending a generic content type ("application/octet-stream"), then Firefox won't actually associate that with any particular application (I suspect because it also is used for executable files).
Sometimes the Open/Save/Cancel dialog will show you the "content type" indicated by the server. Is that information available?
Is this a mail provider that would accept some constructive input on this issue?

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