Firefox will no longer let me access my Yahoo mail due to a certificate problem, and it will not let me add an exception. How do I get into my email?

I have been using this computer and firefox to access my yahoo mail for like 4 years now, but today it decided to stop allowing it, due to a problem with the security certificate. It says: "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." I checked my email successfully early today, but now I can't. I can still get it with internet explorer, but not firefox. How do I fix this?

Take easy and follow some steps:
click on link: mail.yahoo.com
if not opening then can you find there a notification like "blocked"
if yes : Click on that and then select continue without block or any option like that.
Then click the upper yahoo link again .
if you succeeded ,please click on solution,
if not <sub>Edited out by a Moderator, please do not advertise for work</sub> <!--just mail me with your problem. --> <!-- Please do not reverse this edit to invite email contact [https://support.mozilla.org/en-US/messages/new?to=john99 my pm link] -->
[edit} Please continue the thread using [/questions/1038806#question-reply] ~J99 <br>
thanks

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