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Can't uncheck "automatically trust 3rd-party root certificates" (box greyed out)

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The box to uncheck "automatically trust 3rd-party root certificates" is greyed out, and I cannot turn it off. I do not want to automatically trust 3rd-party certificates. How to turn this off if box is greyed out?

I even tried to use the address bar suggestion to turn the "true" value to "false" but as soon as firefox reloads it is reset, & the way to stop that is greyed out.

Firefox is also saying "we've detected unusual traffic from your browser" every time I search, so I am concerned.

The box to uncheck "automatically trust 3rd-party root certificates" is greyed out, and I cannot turn it off. I do not want to automatically trust 3rd-party certificates. How to turn this off if box is greyed out? I even tried to use the address bar suggestion to turn the "true" value to "false" but as soon as firefox reloads it is reset, & the way to stop that is greyed out. Firefox is also saying "we've detected unusual traffic from your browser" every time I search, so I am concerned.
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