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 , select “Developer”, then “Debugger”.