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There’s a command line built into Firefox, which allows various options such as taking screenshots and restarting the browser. It used to open with Shift+F2, but since the upgrade to Firefox 57, that no longer does anything.

I have seen the command line since the upgrade (it was open in one Firefox window, and remained open after the upgrade), so I know that it does still exist in Firefox Quantum. However, I have since closed that window, and cannot get it back. Is there now a different keyboard shortcut to reveal the command line?

The Mozilla documentation for the command line still says Shift+F2.

I am using Firefox Quantum 57.0 on Ubuntu 17.10.

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    Just tested in a VM with a fresh installed firefox 57 it is still shift+f2. maybe backup your bookmarks and so on and start a fresh profile? – Videonauth Nov 22 '17 at 22:50
  • Hmm. I'll try it. – TRiG Nov 22 '17 at 22:52
  • Can someone add a screenshot so I know how it's supposed to look like! – George Udosen Nov 22 '17 at 22:56
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    @George Does this help? i.imgur.com/yFuJOJH.png – Terrance Nov 22 '17 at 23:07
  • Thanks @terrance that's what I got on my try but thought it was wrong – George Udosen Nov 22 '17 at 23:11
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As far I could see while testing, this is still on Shift+F2.

I suggest backing up your bookmarks and so on (Firefox-Sync) and start over on a fresh profile.

This you can do easily by closing Firefox and deleting ~/.mozilla and ~/.cache/mozilla via terminal:

rm -r ~/.mozilla ~/.cache/mozilla

or you can start up Firefox with the profile manager via terminal by:

firefox -P
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  • It's actually working inconsistently for me. Sometimes it opens; sometimes nothing happens. – TRiG Jul 13 '18 at 14:06
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The Graphical Command Line Interface (GCLI) has now been removed from Firefox. Much of its functionality is now in the Web Developer Console.

There are two ways to access the Web Developer Console:

  • Tools → Web Developer → Web Console
  • Ctrl + Shift + K

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