Can't get Unity to install in Firefox

I have tried multiple times to install it. It is listed as an installed program in my ‘uninstall programs’ in Windows. Firefox does not list it as an addon, any time I go to a Unity page it asks me to install it, and if I go to the official Unity download page it says I do not have any version installed.

I have never been able to get this to work at all, please if anyone has any ideas, let me know. If anyone needs any extra system info from me, just ask, I’ll be glad to provide.

Unity does actually have a Technical Support Forum.