Firefox works superfast on start-up then it gets slow and sometimes doesn't work at all

I use xfinity internet service and they told me to clear the cache but that didn't work either. Now I can only use it for a few minutes

Try this. Type in the address bar about:config. Accept the warning. In the page that appears, in the Filter box, type network.http.max-connections. Change the value to 32 (which is probably set to 256 in your case). Close that page. Restart the browser.

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