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cannot open a new firefox window once one is open

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Once I open one Firefox window, I cannot open another one. No error messages received, Firefox just will not open a second time! If I close out of the one open window, I have to log off of my PC then log back in again in order to connect.

Once I open one Firefox window, I cannot open another one. No error messages received, Firefox just will not open a second time! If I close out of the one open window, I have to log off of my PC then log back in again in order to connect.

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Do you have that problem when running in the Firefox SafeMode?

http://support.mozilla.com/en-US/kb/Safe+Mode

Don't select anything right now, just use "Continue in SafeMode."

If not, see this: http://support.mozilla.com/en-US/kb/troubleshooting+extensions+and+theme...

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Are you using the Firefox desktop or QuickLaunch icon to open the second window? If so, try pressing Ctrl+N or using File > New Window to see whether that works any better.