Firefox connections are slow recently, but nothing else happened.
Sometimes there is "Connecting to www.superfish.com" on status bar, but I do not access this website.
Checking connection with "Tamper Data", and found the bottleneck is "http://www.superfish.com/ws/sf_main.jsp?dlsource=calculator".
This connection waits 4 seconds at most, and only when this connection
finished the original connection begins.
Look into the parameters in the url, I thought it might be caused by the addon calculator.
The addon websits said "Remove Smartlinks system and add Similar Products service (can be disabled from the extension preferences) "
The radio set to turn on/off this "service" in the bottom of preferences page.

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