This may be the problem;

Unfortunately, Microsoft has misconfigured a security feature (OCSP stapling) on their servers which got now cached in your local Firefox installation.

In order to resolve that, please enter about:config into the Firefox address bar (confirm the info message in case it shows up) and search for the preference named security.ssl.enable_ocsp_stapling. Double-click it and change its value to false - this will degrade a security feature in Firefox, so please revisit it in a couple of days again after Microsoft has fixed their stuff and turn it back on again then.

See also:

• https://portal.office.com/servicestatus

dep50 said

My homepage has always been msn. Recently, I changed modems to Spectrum. When I open Mozilla it brings me to an unsecure msn site. I keep having to click "try again". If that doesn't work I have to reset my homepage with "tools", options and put in the secure msn address. Please advise.

I did what you said and now I don't have that problem. Thanks so much!!! Dep

Glad to help. Safe Surfing.