Why won't firefox start after updating to version 6.02

When I try to open Firefox,An XUL Runner dialog box opens, and gives comment of:
Platform version '6.0.2' is not compatiblw with
Minversion >=6.0.1
Maxversion <=6.0.1
And that is all I get. I click OK, the box closes, and firefox doesn't open. Only started after new firefox version automatically installed.
What is going on

Download latest Firefox version using one of these links:
* http://www.mozilla.com/en-US/firefox/new/
* http://www.mozilla.com/en-US/firefox/central/
* http://www.mozilla.com/en-US/firefox/fx/
* http://www.mozilla.com/en-US/firefox/all.html
Uninstall your current Firefox
* https://support.mozilla.com/en-US/kb/Uninstalling%20Firefox
* DO NOT SELECT TO REMOVE USER DATA AND SETTINGS
* Restart your system
Install Firefox using the downloaded & saved Firefox installer file
* https://support.mozilla.com/en-US/kb/Installing%20Firefox%20on%20Windows
Check and tell if its working.

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