Javascript and styles fail to load on almost all pages. This Connection is Untrusted also appears for every website.
Tried everything I could think of restarting, re-install, clean re-install, used ccleaner to remove registry entries, ran malware bytes scan, etc... Nothing seems to work except the fresh install Mozilla landing page everything asks that I verify the security certificate and if I can get past that javascript and style don't work for any page, just raw html.
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If you expand the Technical Detail for one of those security errors, do you get more information about why there is a problem?
Some security software (e.g., BitDefender, ESET) filters secure connections in a way that Firefox finds suspicious. If you use either of these products, the first thing to try would be to disable this feature and see whether that unblocks Firefox.
(I don't have these products, but users have flagged these as a solution in past threads:)
BitDefender -> Privacy settings -> disable Scan SSL
ESET -> Setup -> Advanced Setup -> Web and Email -> SSL
SSL protocol: Do not scan SSL protocol
If your secure sites work normally after that, consider installing the software's certificate into Firefox so you can benefit from their filtering without the annoying messages.