running browser as user different than root

[bruce]

Hi.

Trying to understand/figure out some things.

I've logged in as root

I can start a browser -- FF, or chromium, no issue. (I know.. I
shouldn't. but I can.

However, if I fire up a term as another user, and then from the
cmdline, fire up chromium, I get an err msg

No protocol specified
 Gtk-WARNING **: cannot open display: :0

I've been researching trying to figure out how to resolve this.

Any thoughts/pointers?

thanks