All Mozilla websites use HTTPS. Is that what you're asking?

TaffMagoo said

I read recently that all websites are due to convert to HTTPS. When is Mozilla going to do so? If you're not going to covert to HTTPS, why not?

The desktop Firefox for Windows, Mac OSX, and Linux is a web browser for viewing web sites and is not a website, or homepage or a search engine.

You need to be more clear on what you are asking about.

You may find these articles interesting :

https://www.computerworld.com/article/3275726/web-browsers/how-your-web-browser-tells-you-when-its-safe.html

And :

https://www.bleepingcomputer.com/news/software/mozilla-restricts-all-new-firefox-features-to-https-only/