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Firefox will not load certain websites (e.g. cnn.com) but other browsers will. What could be wrong?

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I recently installed a new version of Kaspersky internet security when I noticed Firefox would not load certain websites. I have done the same on two other computers without the problem occurring. I have turned off the security, but Firefox still will not load. When I use other browsers the same problem does not occur.

I recently installed a new version of Kaspersky internet security when I noticed Firefox would not load certain websites. I have done the same on two other computers without the problem occurring. I have turned off the security, but Firefox still will not load. When I use other browsers the same problem does not occur.

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