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Is Firefox causing my win 7 computer to slow

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Is Firefox slowing my Win 7 down, with all you've been adding? I've started cutting cable so went from Comcast to Frontier. Supposed to be 500mbps with ethernet, with Frontier. It is with my laptop, Win 8.1, but desktop is 172 upload & 105 upload. Even with the laptop it gets locked up often when commenting on articles. Again, the desktop worked good with Comcast. Don't know what that speed was. Thx, Ross

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