Hey Lauren

It looks like there is it is called Thimble 

[https://thimble.mozilla.org/en-US/ Thimble Homepage Link

]Hi,

The people who answer questions here, for the most part, are other Firefox users volunteering their time (like me), not Mozilla employees or Firefox developers.

If you want to leave feedback for Firefox developers, you can go to the Firefox Help menu and select Submit Feedback... or use this link. Your feedback gets collected by a team of people who read it and gather data about the most common issues

I Hope that answers your question if not feel free to email me. My Email Address

Also do you need assistance with getting started in Thimble? I can help you get started

http://www.nvu.com/ <<< i use it now free.

https://www.webpagesitebuilder.com/

https://www.openelement.com/

lauromorro said

I am trying to create a website. Mozilla used to have a free WYSIWYG web design program called SeaMonkey, but I think it does not exist any longer. Can you tell me if you have something that replaced it? If so, what would that be? Thank you for any help you can provide. Lauren Morrison

sea monkey is aval i have it now just got it. https://www.seamonkey-project.org/ i was testing it cause of the Thunderbird embedding