click the padlock or "i" icon in the address bar, then the ">" button, then More Information, and finally the "View Certificate" button.(menu bar) Tools > Page Info > Security > "View Certificate".
#THIS CONNECTION IS NOT SECURE MOZILLA MAC#
right-click (on Mac Ctrl+click) a blank area of the page and choose View Page Info > Security > "View Certificate".Since you changed the setting, you can see that right from the Page Info dialog. I recommend you always investigate who is the man in the middle before you do that. You should never need to create an exception for a well-run commercial website, particularly one that handles sensitive data. When you change the preference, you are telling Firefox to accept the signing certificates saved in the Windows/Mac certificate store as valid authorities, as a shortcut to setting them up in Firefox's own certificate store.
#THIS CONNECTION IS NOT SECURE MOZILLA SOFTWARE#
However, the software sometimes fails to set up Firefox. Usually any "man in the middle" will insert a certificate into the system certificate store so that IE, Chrome, and Safari will not notice the problem. That could be something innocent like your parental control or security software, or it could be malware or a distrustful government somewhere. The UNKNOWN_ISSUER message most often indicates there is a "man in the middle" of the connection between Firefox and the website. Hi decay, I just want to add a note on why that works. Good luck - I hope this helps to fix your Yahoo email login problem, too! Here's the site where I found the info, under the "Experimental Built-in Windows Support" section: Close the window, then go back to your Yahoo email login and try again. If it's marked as "false" then double-clicking it should turn it to "true" In the search field, type in security.enterprise_roots.enabled and hit enter - you'll be left with one field Open a new window in Firefox and type "about:config" without the quotes and hit enter
The steps to fix it are these, and I cite the original web page further below:
If you understood that last sentence, then it means you've probably done it on your computer I know I have. Today this happened again with no ability to add an exception, and after looking at various websites for hours, trying to find a fix, I stumbled on one: Having Firefox ".automatically search for and import CAs that have been added to the Windows certificate store by a user or administrator." These are root certificates which you've manually imported. Unfortunately, it does not give you the option to add an exception, which clears up the problem most of the time.
Periodically when Firefox is updated, it starts rejecting Yahoo Mail from loading, giving the "Your connection is not secure" / SEC_ERROR_UNKNOWN_ISSUER error.
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