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Firefox is hung up. Will do nothing, even won't let me shut the computer down and reboot

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Firefox is hung up and won't even let me shut the laptop down and reboot. It says "not responding".

This happened

Every time Firefox opened

Today

User Agent

Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; GTB6.5; .NET CLR 1.1.4322; .NET CLR 2.0.50727; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729)

Firefox is hung up and won't even let me shut the laptop down and reboot. It says "not responding". == This happened == Every time Firefox opened == Today == == User Agent == Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; GTB6.5; .NET CLR 1.1.4322; .NET CLR 2.0.50727; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729)

Alle svar (1)

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 to open the Windows Task Manager, then select the Processes tab and locate the firefox.exe process.  Click on it so it is highlighted, then hit the End Process button.