firefox 50 saying your connection is not secure to every website

Have you checked your OS? Are the time zone, date, and time settings correct?

So you have version 50.1.0?

Does this happen on any site you connect to (HTTP & HTTPS)?
Even on sites that do present a valid security certificate?

Have you checked your OS? Yes.. time zone, date, and time correct. Having no issues booting safe with networking? I have version 50.1.0    Q: Does this happen on any site you connect to (HTTP & HTTPS)? Yes. If it runs in Win 7 safe mode, something must be loading to put this thing sour. How do I load things one at a time to troubleshoot?

Steve

new flag gotten: An error occurred during a connection to www.dog.com. Peer’s certificate has an invalid signature. Error code: SEC_ERROR_BAD_SIGNATURE

If you do a clean boot in Windows will Firefox work?
How to:
https://support.microsoft.com/en-us/kb/929135

Did you try to reset Firefox?
How to:
https://support.mozilla.org/en-US/kb/refresh-firefox-reset-add-ons-and-settings

Check your plugins and extensions.  You may have added something which is causing this.  Try disabling any that seem suspicious.  Close Firefox and restart and see if the problem goes away.

Try refreshing Firefox.
    Click the menu button and then click help .
    From the Help menu choose Troubleshooting Information. ...
    Click the Refresh Firefox button in the upper-right corner of the Troubleshooting Information page.
    To continue, click Refresh Firefox in the confirmation window that opens.
    Firefox will close to refresh itself.

Does it do the same thing in internet explorer? If not then i would reinstall firefox and see what happens. Once you uninstall then go to your c:\users\%username%\appdata (You will need to show hidden folders in folder options) folder and delete any folders with firefox. Then do the reinstall.

To be extra safe i would scan with malwarebytes in safe mode as well.

iSSUE MAY BE SOLVED, WILL RESPOND TO CONSULTANTS

Tried all things suggested. Changing Eset SSL protocol  seemed to work, but loading the original profile and INSERTING that profile into the profile.ini  seemed to close the deal.  When refreshing or reinstalling, the damn install utility hunts for the old profile and dumps it. I had to move it to another drive and rename it to hide it from the FFGremlins.  Seem to see all sites now. Hope it stays fixed.  You folks are just heavenly...thanks for all solutions!

Steve