Since updating to 2019 version I have been getting "Insecure Connection" with some websites using Firefox. One of the ones I get it with is Facebook. Previously, clicking Advanced would give you the option to ignore it but this cant be done as I get the following message:- "This site uses HTTP Strict Transport Security (HSTS) to specify that Firefox only connect to it securely. As a result, it is not possible to add an exception for this certificate." This is also happening on Google