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If a network user opens Firefox on a mac 10.6 machine, it will no longer launch on a 10.4 machine - why?

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If the network user's Library folder is re-named(deleted), they can launch in 10.4 again. But as soon as they launch Firefox on a 10.6 mac, 10.4 computers won't launch it. Tried renaming only specific Mozilla, Firefox, and Internet folders and prefs with no results.

If the network user's Library folder is re-named(deleted), they can launch in 10.4 again. But as soon as they launch Firefox on a 10.6 mac, 10.4 computers won't launch it. Tried renaming only specific Mozilla, Firefox, and Internet folders and prefs with no results.

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Are both using the same profile?

You can only start Firefox once with a specific profile.

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The profiles are saved in the users' network home, so it is the same profile. But the logins are not simultaneous. I've also tried renaming only the Firefox/Mozilla files in App Support so I don't believe it to be a profile issue. It seems as though some other file in their Library is being modified when they login on a 10.6 machine that won't allow the app to launch after they logout and switch to a 10.4 machine.