There are three ways to open the debugger:

  • select "Debugger" from the Web Developer submenu in the Firefox Menu (or Tools menu if you display the menu bar or are on Mac OS X)
  • press the CtrlShiftS (CommandOptionS on OS X) keyboard shortcut

    Note: When Firefox 66 is released, this shortcut will no longer open the debugger.
  • press the menu button ( new fx menu ), press "Developer", then select "Debugger".


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