Firefox would not connect after upgrade. Did system restore (XP) and not firefox wont even start

Firefox would not connect after upgrade from verion 6 to version 7. Did system restore (XP) and now firefox wont even start

Sometimes Firefox will hang during startup or shutdown, and still be running invisibly in the background. Usually in that case, you need to "kill" it either by restarting Windows or using the Windows Task Manager. It sounds as though you are familiar with opening the Processes tab, finding firefox.exe, and using End Process.
If you use an advanced firewall or other security software that tracks which programs are permitted to use the internet, please see these articles:
* [[Fix problems connecting to websites after updating Firefox]]
* [[Configure firewalls so that Firefox can access the Internet]]
A couple of other suggestions:
(1) Can you start Firefox in its Safe Mode? Hold down the Shift key when starting Firefox. You should get a two-button dialog. Click "Start in Safe Mode" (''not'' Reset). Any difference?
(2) In case your regular software missed something that is interfering with Firefox, try the scanning and clean-up tools listed in this article: [[Troubleshoot Firefox issues caused by malware]]

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