I know there's a command-line syntax in apt-get to enable the squeeze repo, but I'm not sure what it is. My method would be to either open synaptic and add the following and enable it temporarily, update, install the version of xulrunner you want and then un-enable that repo and update again.
Or you could use an editor like nano or use gksudo and geany or whatever you prefer to add this line to your /etc/apt/sources.list and then comment out the line afterward.
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deb http://ftp.us.debian.org/debian/ squeeze main contrib non-free
Obviously that's a good mirror location for the u.s., if you're elsewhere then adjust per your current sources.list
If you currently have a newer version of xulrunner installed, it might complain. If so you might want to download the deb package from the mirror, which you can find from here: http://packages.debian.org/stable/xulrunner-1.9.1
You will then have to either use gdebi on the desktop if you have it installed, or dpkg in a terminal (sudo dpkg -i xulrunner-126.96.36.199-9.deb) and it should install.