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firefox -ProfileManager

firefox -url http://superuser.com &
xdotool search --sync --onlyvisible --class "Firefox" windowactivate key F11

"firefox.exe" -url http://superuser.com -fullscreen

$ cat /var/tmp/firefoxfullscreen.sh
#!/bin/bash
export DISPLAY=:0.0 # eye
cat > /var/tmp/index.html << EOF
<html>
<head><meta http-equiv="refresh" content="3" />
<style>
html {
  background: url("http://192.168.0.142:7007/video/vnc.jpeg") no-repeat center center fixed;
  -webkit-background-size: cover;
  -moz-background-size: cover;
  -o-background-size: cover;
  background-size: cover;
}
</style>
</head>
<body>
</body>
</html>
EOF

ps aux | grep firefox | awk '{print $2}' | xargs kill -9; # kill me
firefox "/var/tmp/index.html" & # leave me alone
sleep 5 # hehehe
xdotool key F11 # hit full screen