How to debug chrome extension service worker for manifest v3?

I guess you are looking for the internal ServiceWorker (backend page) of your extension and their connections.

There are two URLs you should be aware of:

1. chrome://inspect/#service-workers
2. chrome://serviceworker-internals/?devtools
3. You might also want to “debug the debugger” e.g. for breakpoints inside your extension page.

1. Registered ServiceWorker list (normal + internal)

chrome://inspect/#service-workers

2. ServiceWorker activity (active connections/clients, console logs, … )

chrome://serviceworker-internals/?devtools

3. Inspect DevTools extension

• Option A: From contextmenu

  1. Open your extension panel

  2. Open contextmenu and select inspect

  3. 2nd DevTools instance opens

     

• Option B: From extensions page

  1. Open chrome://extensions

  2. Find your extension click “Details”