Downloaded latest version of Firefox and now can't open any Excel files

The problem started right after I downloaded the latest version of Firefox (4?). When I try to open my Excel files I get a Windows error message and then it says that Excel can not find the file.

A possible cause is security software (firewall) that blocks or restricts Firefox or the plugin-container process without informing you, possibly after detecting changes (update) to the Firefox program.
Remove all rules for Firefox from the permissions list in the firewall and let your firewall ask again for permission to get full unrestricted access to internet for Firefox and the plugin-container process.
See:
* https://support.mozilla.com/kb/Server+not+found
* https://support.mozilla.com/kb/Firewalls
* http://kb.mozillazine.org/Browser_will_not_start_up

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