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Any way to downgrade only one user's account?

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My son's school has informed us that we need to downgrade Firefox to version 3.5 in order for him to be able to use PowerSpeak for his German lessons. I do not feel safe in doing this. Is there any way to just change the version of the browser on one user's account, instead of on my entire computer?

My son's school has informed us that we need to downgrade Firefox to version 3.5 in order for him to be able to use PowerSpeak for his German lessons. I do not feel safe in doing this. Is there any way to just change the version of the browser on one user's account, instead of on my entire computer?

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It gets a bit complicated when doing that; all users are affected when it comes to the "default browser" being the last installed version. Your best course of action is to install an older version of Firefox Portable in that one user account, as the Portable version installs in its' own folderset and doesn't write to the Windows Registry.

http://portableapps.com/apps/internet/firefox_portable/localization#legacy35