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A yellow banner comes on top of the page saying, "A web page is slowing down your browser" and it keeps happening

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I keep getting a yellow banner on top saying, " A web page is slowing down your browser" and everything is very slow and I can't ever fix it and then firefox will not respond.

I keep getting a yellow banner on top saying, " A web page is slowing down your browser" and everything is very slow and I can't ever fix it and then firefox will not respond.

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”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

https://support.mozilla.org/en-US/kb/task-manager-tabs-or-extensions-are-slowing-firefox