Run X application as another user

[bforbes]

I'd like to run an X application, such as Firefox, as another user, for testing purposes. I've tried a couple things. I got a terminal, and tried:

su - otheruser
firefox

But firefox said "Cannot open display". So I tried:

su otheruser
firefox

Firefox started up, but it looked like it was being run as the original user. All of the original user's bookmarks were there, and were writable by Firefox.

How can I do this? I want Firefox to really think it is running as "otheruser".

[weapon-x]

#Open the Run command.
#Type firefox and Run it as the root And root Password in the options.

[weapon-x]

#Open the Run command.
#Type firefox and Run it as the root And root Password in the options.

Read more : http://www.flynix.profusehost.net/viewtopic.php?t=37

[bforbes]

That doesn't work for me. Firefox is still running as the original user. I figured out how to do it though:

echo $DISPLAY
xauth list "$DISPLAY"
su - otheruser
xauth add <output from xauth above>
export DISPLAY="<output from echo $DISPLAY>"

Bada bing bada boom.
Here's where I found that method:
http://www.linux.com/howtos/Remote-X-Apps-7.shtml

[gigo6000]

An easier way to do this is, , specially in this case that we're on the same machine is to use the xhost authentication method:

xhost +   (allow everyone to connect to X server, you could use also xhost +otheruser)

su otheruser

firefox