I few weeks ago something changed in firefox that I have been using for years. (maybe an upgrade) It will not let me access anything. I called Comcast who I use and all they can suggest is switch to Google Chrome. It works but very slow to impossible to use. Has Mozzila Firefox changed? This is what I get: Your connection is not secure The owner of search.yahoo.com has configured their website improperly. To protect your information from being stolen, Firefox has not connected to this website. This site uses HTTP Strict Transport Security (HSTS) to specify that Firefox may only connect to it securely. As a result, it is not possible to add an exception for this certificate. Learn more… Report errors like this to help Mozilla identify and block malicious sites Can you help?