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firefox 43.0.4 svchost taking all resources

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After running for a while my pc is slow. SVCHOST.exe taking all the system resources. I close the process and the pc is fine for a while. This has been happening for days. I finally come to find out that it is Firefox because when I close the process all program work fine but Firefox. When I try to close Firefox the pc display a black screen. I have to hold the power buttong to shut down and then reboot the pc. Any ideas why this happens?

PS. I reset FireFox.

After running for a while my pc is slow. SVCHOST.exe taking all the system resources. I close the process and the pc is fine for a while. This has been happening for days. I finally come to find out that it is Firefox because when I close the process all program work fine but Firefox. When I try to close Firefox the pc display a black screen. I have to hold the power buttong to shut down and then reboot the pc. Any ideas why this happens? PS. I reset FireFox.

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Please update to the most recent version of Firefox: