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I need to work out a way to have Firefox 4 or 3.6 on OSX to auto open Word, Excel and Powerpoint file types from a local intranet.

I have setup Firefox under a localuseradmin with the file types set to open automaticly and then I copied the Firefox/Mozilla folders into the /system/library/user template/ but when a new user logs in the file type association is set back to default when Firefox runs.

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Firefox supports a global preferences file which sets defaults for users who don't already have a preference setting of their own. This file can also contain "lockPref" entries, which sets preferences even if the users do already have their own setting.

This link details setting up a system-wide home page in Firefox 4. The instructions are for Windows, but they should work fine on Mac OS X with the appropriate paths.

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