When you get this for pretty much all secure sites, the problem usually is one of the following:
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(1) Error in your system's date, time, or time zone, which throws off certificate validity checks. Sometimes allowing computers to use an internet-based time source can introduce this problem.
Your Connection Is Not Private Error
(2) Firefox not being set up to work with your security software that intercepts and filters secure connections. Products with this feature include Avast, BitDefender, Bullguard, ESET, and Kaspersky; AVG LinkScanner / SurfShield can cause this error on search sites.
If you have any of those specific security products: check this support article: How to troubleshoot security error codes on secure websites.
(3) On Windows 10, Firefox not being set up to work with the parental control software Microsoft Family Safety. (To test by turning it off, see: http://windows.microsoft.com/en-us/wi.../turn-off-microsoft-family-settings)
(4) Malware on your system intercepting secure connections.
If none of those ring a bell:
You could inspect a sample certificate to see whether that points to the culprit. If you want to try that now, here's how I suggest starting:
Load my test page at: https://jeffersonscher.com/res/jstest.php
You likely will get an error page. Expand the 'Advanced' button and look for an Add Exception button.
Note: You don't need to complete the process of adding an exception -- I suggest not adding one until we know this isn't a malware issue -- but you can use the dialog to view the information that makes Firefox suspicious.
Click Add Exception, and the certificate exception dialog should open.
Avast For Mac Your Connection Is Not Private Error
Click the View button. If View is not enabled, try the Get Certificate button first.
Avast For Mac Your Connection Is Not Private Chrome
This should pop up the Certificate Viewer. Look at the 'Issued by' section, and on the Details tab, the Certificate Hierarchy. What do you see there? I have attached a screen shot for comparison.