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Invalid Security Certificate Errors

If you are receiving an error like this:  

You may need to add a certificate for the website.

MAKE SURE YOU ONLY DO THIS FOR WEBSITES THAT YOU TRUST! 

1) Go to Preferences or Options / Advanced / Certificates / View Certificates / Servers

2) Click on Add Exception button

3) Add the required Website URL

4) Click Get Certificate

5) Click Confirm Security Exception

6) Click OK

7) Close the preferences panel