To open the developer console window on Chrome, use the keyboard shortcut
Cmd-Shift-J (on Windows) or Cmd-Option-J (on Mac).
Alternatively, you can use the Chrome menu in the browser window, select the option "More Tools," and then select "Developer Tools."
To open the console on Edge, hit F12 to access the F12 Developer Tools. Once in the F12 Developer Tools, navigate to the Console tab.
To open the console on Firefox, use the keyboard shortcut CmdShiftK (on Windows) or CmdOptionK (on Mac). The toolbox will appear at the bottom of the browser window, with the Web Console activated.
Alternatively, under the header Tools in the Mac menu bar, navigate to the sub-menu Web Developer and select Web Console.