Running 2 firefox instance on a Linux machine using same user account but display on remote Xming servers on 2 Windows separately

Question

I have a Linux machine and 2 Windows desktop. The 2 Windows have Xming installed. I tried to use SSH and remotely run firefox on Windows. But I find second Firefox will also open on the Windows which run the first Firefox. Anyway to force Firefox open on the Windows running the SSH? Thanks.