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How do I get Firefox to load google pages?

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I upgraded to windows 10, downloaded the new Firefox for windows 10. Every webpage I try to go to except mozillas makes me make a security exception because a cert is wrong. When going to google sites it won't let me even make an exception. How do I fix this?

I upgraded to windows 10, downloaded the new Firefox for windows 10. Every webpage I try to go to except mozillas makes me make a security exception because a cert is wrong. When going to google sites it won't let me even make an exception. How do I fix this?

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Usually this is caused by Firefox not being set up to work with your security software. Due to changes in Windows 10, you may have updated Avast, Kaspersky, ESET or BitDefender to a new version. Do you use one of those? To see whether that is the issue, try returning to a site where you saved an exception and then: click the padlock in the address bar (or gray warning triangle, as the case may be), click More Information, then click View Certificate. In the section labeled "Issued by" does it mention your security software? If so, which one is it?