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how to start xclock (or something else) to be displayed on my HDMI device on Raspbian console session?

I have a raspberry pi 2 and installed the Raspbian Version from 2015-05-05.

As "boot option" I chose "Console Text console..." because I don't want a full desktop.

I logged in from my remote PC via SSH (putty). I want to start Firefox but get the following error:

root@raspberry:~# firefox

(process:2425): GLib-CRITICAL **: g_slice_set_config: assertion 'sys_page_size =                                   = 0' failed
Error: no display specified

If I try to start xclock I also get an error:

root@raspberry:~# xclock
Error: Can't open display:

I want to start the programs on my display connected via HDMI. Even if I do this directly on my raspberry console it doesn't work.

How can I tell my raspberry to display this programs on my via HDMI connected Display?