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The registry entries for the shell handlers are probably half one way and half the other.
Short of an OS reinstall, I'd suggest using the configuration dialog boxes of each browser to tell both IE and Firefox that neither of them is the default browser, and telling both not to check when they start up. Save those settings, and then re-select whichever one you want to use as the default browser.
Jim
I also associated Internet Shortcuts with FF and found other applicable items were correctly associated with FF.
Although I hate to ask, is there an item in the Register I could check and maybe change?
[kb.mozillazine.org...]
and the first one seemed to work. The problem is having the "Use DDE" checked in the protocol(?) for opening certain types of FF files.