Firefox will not access the internet, internet connection is ok, safari accesses it

Address bar will not accept address. Google window will not search, either. Safari is working, Firefox and Chrome are not.

When did this start? Which version of Firefox?
For reference, Firefox 23.0 was released on Tuesday, August 6th, and Firefox 23.0.1 was just released on Friday, August 16th.
Does the address bar work normally in Firefox's Safe Mode? That's a standard diagnostic tool to bypass interference by extensions (and some custom settings). More info: [[Troubleshoot Firefox issues using Safe Mode]].
If Firefox is running, you can restart Firefox in Safe Mode using
Help > Restart with Add-ons Disabled
In the dialog, click "Start in Safe Mode" (''not'' Reset)
If Firefox is not running, hold the Shift key when starting Firefox to get the Safe Mode dialog.
Any difference?

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