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how do i start firefox 4 in fullscreen mode (the one activated by pressing f11)?

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Create a new profile by running:

firefox -ProfileManager

Run firefox with the new profile, move to full screen using F11 and then close it by alt + f4

Each time you will use this profile it will be opened in full screen.

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Do not forget the "-no-remote" option if you already have a running instance of Firefox: "firefox -ProfileManager -no-remote" – Wilbert Nov 15 '12 at 8:31
After making the profile and closing Firefox in full screen mode you can use "firefox -P 'Session Name' -no-remote" to start Firefox in full screen mode. – Wilbert Nov 15 '12 at 8:37
Does not work for me (in 2016) – Karel Bílek Feb 4 at 11:37
@KarelBílek just installed it and it works! – Mike Szyndel Feb 16 at 10:48
@MichalSzyndel interesting! I will try it again – Karel Bílek Feb 17 at 3:11

Command Line

Firefox command line option -fullscreen didn't work for me:

"firefox.exe" -url -fullscreen


But the use of R-kiosk 0.9.0 extension by Kimmo Heinaaro works like a charm.

Real Kiosk is a Firefox extension that defaults to full screen, disables all menus, toolbars, key commands and right button menus. Alt+Home still takes you home.

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Does not work anymore (in 2016) – Karel Bílek Feb 4 at 11:36
@KarelBílek just installed it and it works! – Mike Szyndel Feb 16 at 10:48

If you're using firefox 3 you can use this extension. It allows fullscreen on start. Tons of others do as well, see here.

I'm not aware of a command-line switch though.

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Full-screen me dad!

$ cat /var/tmp/ 
export DISPLAY=:0.0 # eye
cat > /var/tmp/index.html << \EOF
<head><meta http-equiv="refresh" content="3" />
html { 
  background: url("") no-repeat center center fixed; 
  -webkit-background-size: cover;
  -moz-background-size: cover;
  -o-background-size: cover;
  background-size: cover;

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
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You may try R-KIOSK with work really good.

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I would give you +1 if you would explain a little more if you explain a little more what it is, what it does and what your personal experience is. – MadMike Sep 14 '15 at 12:49
I agree with @MadMike. +1 after a nice explanation :-) – AlexGreg Sep 14 '15 at 13:01

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