Check this article; https://support.mozilla.org/en-US/kb/how-do-i-tell-if-my-connection-is-secure How do I tell if my connection to a website is secure?

Ive already read that but how do I get to a situation where my Hotmail has a green triangle rather than the grey one with amber exclamation mark ?

What web address are you using? https://outlook.live.com

Decided quickest way of dealing with this was to uninstall Firefox and use another browser! Problem solved ! Back to Explorer for now - not the best but got me working again today which was the main thing rather than wasted time trying to solve it.