Firefox opened in client not on server then using ssh -XC remote running?

[piark]

 * Cinnamon version (cinnamon --version)
   - Please specify if you are using the daily builds PPA
     (https://launchpad.net/~linuxmint-daily-build-team/+archive/ubuntu/daily-builds).
 * Distribution - (Mint 17.2, Arch, Fedora 25, etc...)
 * Graphics hardware *and* driver used
 * 32 or 64 bit
 * Attach ~/.xsession-errors, or /var/log/syslog

Issue

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Expected behaviour

Other information

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[piark]

Cinnamon version 5.0.6 when i running ssh command, like , ssh -XC myserver and , run firefox &, in the remote server. and, in same time, having firefox already started on client.

The calls of file://home/myuser/file show the content of client directory , not the server directory.

Running without problem when using option "firefox --new-instance".

There is appear to be a problem because the server process is not

Si suggest that is a problem but i'm not sure there is the good place to do this.

That seems to be a problem because a remote process should not be able to access from server to client, at the processes of the client machine. It seems that this mode of operation can pose serious security problems, second problem is the two users is not the same user, but, appear to be a control on a currently running process on the client side.....

Thanks you. Regards.