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Browser slowing or stopped

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I keep getting a message in the top of my screen and it says a program is slowing down my computer. It asks if I want to stop the program, site or whatever, or wait. I click on Stop but it never really helps. How do I find out which site or program is slowing down my browser and eliminate it? Thank you.

I keep getting a message in the top of my screen and it says a program is slowing down my computer. It asks if I want to stop the program, site or whatever, or wait. I click on Stop but it never really helps. How do I find out which site or program is slowing down my browser and eliminate it? Thank you.

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What are the exact error message(s) ?

”Webpage is slowing down your browser” This is the new way the browser tells you there is a problem with the script program(s). https://support.mozilla.org/en-US/kb/warning-unresponsive-script?cache=no

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I will try to write down the exact message the next time I see it. Thanks for your help.