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Upgraded to 7.0.1 and then Firefox would not launch.

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Upgraded to 7.0.1 last night. Firefox would not launch afterward. Hour glass appears for a few seconds then goes away. I can see on Task Manager that Firefox.exe appears in the Proceses list and then after a few seconds disappears. No browser, no error message. After going through every troubleshooting step I could find I removed 7.0.1, downloaded 3.6.23 from Firefox site and this works fine.

Upgraded to 7.0.1 last night. Firefox would not launch afterward. Hour glass appears for a few seconds then goes away. I can see on Task Manager that Firefox.exe appears in the Proceses list and then after a few seconds disappears. No browser, no error message. After going through every troubleshooting step I could find I removed 7.0.1, downloaded 3.6.23 from Firefox site and this works fine.