Downloaded Firefox, cannot open because it says I am offline, and need to change, cannot do this without opening browser.

I got a notice that my Firefox was outdated. I was using something earlier than 3.6.3. I downloaded v4.0.1, and followed instructions for installing. I closed every other application was using at the time. When I attempted to open Firefox, I got a message that it was in off-line mode, and needed to be changed. I cannot change mode of operation without its beng open. I am stuck. I have many things on my computer that is opened using Firefox, and they will not open, either. I do not know yet if I will have all my old bookmarks.

Doesn't Firefox start even in offline mode?
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

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