Firefos not allowing people to open website that is fully qualified domain and https

Greetings, I have a website for my small business and I do a newsletter for my customers. The newsletter includes links to my home page, which is a fully qualified domain, https://www.prettypennydesigns.net/ When I check my newsletter, the link to my website goes to Firefox's home page. Can anyone tell me why this is happening? I also have a link to my contact page and that link does work. Thank you so much for any help!