Browser development tools using skills (two) JS debugging + and background docking error debugging

1-1 js debug

There is a problem with the description: when the check box is clicked, errors can be displayed both inside and outside the function body

2-1 Error debugging of interconnection with the background

3-1 event listening breakpoints

4-1 Two methods to simulate mobile terminal

5-1 Internet Explorer

6-1 Firefox

Simulates resolution but does not simulate real devices

That's it