backward compatibility - moving a profile from Windows 7 to Windows XP - can this be done?
I was trying to move my profile from a notebook computer running Windows 7 to my old desktop, running Windows XP. After doing this, I get an error message "Firefox is configured to use a proxy server that is refusing connections" Now my desktop does not access the internet at all, even using internet explorer.
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It is not really recommended to move a full profile from one computer or OS to another computer.
Only move the files that you really need and that are safe to copy.
See http://kb.mozillazine.org/Transferring_data_to_a_new_profile_-_Firefox
See "Firefox connection settings" in Server Not Found - Troubleshoot connection problems
You can find the connection settings in Tools > Options > Advanced : Network : Connection
If you do not need to use a proxy to connect to internet then select No Proxy