help echo $BROWSER js 'alert("hello")' jsh alert hello jsh enterVR enterAR exitVR exitAR tail -n1 -f /dev/browser/console /var/log/messages require https://snips.sh/f/VBz-iWm8so?r=1 require https://xrfragment.org/example/assets/index.glb require https://coderofsalvation.github.io/xrsh-media/assets/background.glb