Firefox suddenly stops loading any sites; error message "your connection is not secure".
Firefox won't open any websites at all, including Firefox Support. I have tried opening in Safe Mode to disable addons, extensions and plugins. I have tried restoring Firefox to default settings. I have tried uninstalling a recent Windows update.
Vybrané riešenie
This 1st : Type or paste about:studies in the address bar and press Enter (or Return) to load that page. If you are enrolled in a user interface experiment, it should be listed on this page and there should be a way to uninstall/remove or to opt out.
Can you find it there (unified-search)?
More info about SHIELD studies and how to opt out globally if you prefer: About SHIELD Studies. https://support.mozilla.org/en-US/kb/shield
Suggest : https://support.mozilla.org/en-US/kb/troubleshoot-SEC_ERROR_UNKNOWN_ISSUER
fyi: graphic card drivers are from Date: 9-29-2016 suggest updating if possible. Fyi: one or more of your Extensions are not compatible with multi-processing so it is turned off. You should check your Extension Page for Legacy Extensions and see if they are going to update for Firefox Version 57 as all Legacy addons will be disabled or removed in ver 57
You can also contact the Developer of the Extensions to see if they are updating them for ver 57 Quantum release date Nov 14th https://www.mozilla.org/en-US/firefox/quantum/
Please let us know if this solved your issue or if need further assistance.
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Vybrané riešenie
This 1st : Type or paste about:studies in the address bar and press Enter (or Return) to load that page. If you are enrolled in a user interface experiment, it should be listed on this page and there should be a way to uninstall/remove or to opt out.
Can you find it there (unified-search)?
More info about SHIELD studies and how to opt out globally if you prefer: About SHIELD Studies. https://support.mozilla.org/en-US/kb/shield
Suggest : https://support.mozilla.org/en-US/kb/troubleshoot-SEC_ERROR_UNKNOWN_ISSUER
fyi: graphic card drivers are from Date: 9-29-2016 suggest updating if possible. Fyi: one or more of your Extensions are not compatible with multi-processing so it is turned off. You should check your Extension Page for Legacy Extensions and see if they are going to update for Firefox Version 57 as all Legacy addons will be disabled or removed in ver 57
You can also contact the Developer of the Extensions to see if they are updating them for ver 57 Quantum release date Nov 14th https://www.mozilla.org/en-US/firefox/quantum/
Please let us know if this solved your issue or if need further assistance.
Thank you to both responders! A link within Pkshadow's response had the solution: the device had malware installed. I ran a malware-detector which quarantined malware on the device and this solved the problem.