Instead of changing my host file I'd like Firefox to think my domain is on my own server while my other browser uses the real IP address. I used to edit my host files but that forces both browsers to change the IP address.

I found change host, but it doesn't appear to use the alternative host file. I also saw a comment asking when it will work on Firefox 6+.

I tried Host Admin and it fails. It works but the alternative IP address must be in your host file already (which I don't want) and it lets you deselect a domain so the host file is ignored which is not what I want.