WebIDE allows you to use Firefox's awesome developer tools for applications that run in the Simulator via WebIDE as well. To use them, simply click on the Settings icon (which looks like a wrench) beside the Install and Run icons that you used to get the app installed and running. This icon says Debug App on hovering the cursor over it. Click on this to reveal developer tools for the app that is running via WebIDE.
Click on Console, and you will see the message Hello Firefox, which we gave as the input in
console.log() in the
app.js file. Note that it also specifies the app ID of our application while displaying