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3.6 won't load. will upgrsde to 4. Will Mozback backup restore to ver 4?

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After an upgrade sometime ago Firefox 3.6 refused to load. Nothing happens when clicking the icon. Have decided to remove 3.6 and install Ver 4. I have previously used the Mozbackup program to transfer profiles and other data. Will this work transferring from Ver 3.6 to Ver 4? I have read many FAQ's on transferring Profiles etc but none mention Mozback which I have always found quick snd easy I am using Windows XP home

After an upgrade sometime ago Firefox 3.6 refused to load. Nothing happens when clicking the icon. Have decided to remove 3.6 and install Ver 4. I have previously used the Mozbackup program to transfer profiles and other data. Will this work transferring from Ver 3.6 to Ver 4? I have read many FAQ's on transferring Profiles etc but none mention Mozback which I have always found quick snd easy I am using Windows XP home

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Here is the MozBackup support page.
http://mozbackup.jasnapaka.com/support.php

That application, like most made for Mozilla products, is a 3rd party application.