Inspect elements of a website (JavaScript, HTML, CSS) on Android

On the tablet (or smartphone) running Android:

• Activate Developer Mode (by going to Settings, About Tablet, Software Information, and tapping on the Build Number 12 times). A new menu named "Developer Options" will be added to Settings.
• In Settings, go to Developer Options and check USB Debugging.
• Open Firefox, go to the three vertical dots, and choose Settings.
• Check Remote USB Debugging.
• Connect the tablet to your PC via USB.
• Go to the site you want to inspect.

On the PC:

• Open Firefox.
• In the address bar, type about:debugging and press Enter.
• In the Connect a Device section, click the Enable USB Devices button.
  
  
• You should see the tablet in the left menu. Click the Connect button.
  
  
• The screen now displays the tabs open on the tablet. Click Inspect to inspect the code from the PC.