Open the debugger

There are three ways to open the debugger:

  • Select the Debugger panel in the Web Developer Tools, accessible from the Browser Tools submenu

  • Press Ctrl + Shift + Z on Windows and Linux, or Cmd + Opt + Z on macOS (starting in Firefox 71; prior to Firefox 66, the letter in this shortcut was S).

  • Press the menu button image1, select “Developer”, then “Debugger”.