You can use Safari on macOS to debug the extension running in the Simulator.

1. Enable Developer menu in Safari. (Safari - Preferences - Advanced tab - "Show Develop meny in menu bar") 2.In the Safari - Develop menu you'll be able to see what is running on your simulator(s) and select to debug it in Web Inspector.

If you are trying to see the logs of console.log("some message") they are indeed in the Develop -> Show Web Inspector menu in Safari. If you don't see Develop you will have to enable it in Preferences -> Advanced.

In order to see the console.log output of your extension's javascript, there are 2 things to note.

• console.log messages in content.js will be logged to the console where you usually see log output.

• However, if you want to see the log output of your background.js script you will need to do this:

  Develop -> Web Extension Background Pages, that will popup another console connected to your background.js.

For a more thorough explanation see my answer here: https://stackoverflow.com/a/70597271/348121