Make sure the add-on ADB helper is installed on your computer.


Go to Menu -> Developer -> WebIDE (Shift + F8)

Check your smartphone appeares under the USB DEVICES section.

Click on your device.


Allow the connection that the WebIDE stablishes with your smartphone. It is advised to disable the screen lock while we are debugging so that we don’t lose the connection.


Click on the web page under the TABS section.

Click on the tool to activate the debugging tools.