How do I identify and remove this unknown Chrome extension?

hello
OP, i had similar concerns and that's how i found your question. this is what i found after some research.

It looks like it is TTS extension (text to speech). And this is API for it https://developer.chrome.com/docs/extensions/reference/api/ttsEngine

if you go to chrome://serviceworker-internals/ you will find it with status
Running Status: STOPPED

But if you install some extension that utilizes TTS engine (for example, like this https://chromewebstore.google.com/detail/text-to-speech-tts/cpnomhnclohkhnikegipapofcjihldck/reviews )
and run some text to speech, you will find that extension status is now
Running Status: RUNNING

Now you can click "inspect" on the service worker and you will be able to inspect 'tts_extension.js' file etc
you can investigate that extension here
~/.config/google-chrome/YOUR_PROFILE/Extensions/cpnomhnclohkhnikegipapofcjihldck/...

As for my thoughts,
Why Google made it that way, I have no idea, but for me it is also concerning that i cannot remove all service workers.
For now it feels harmless, but who knows what it is going to do in the future. Probably time to look for another browser.

best regards

Have you tried manually deleting the corresponding files? Look up where Chrome stores its extensions and see if you can find it in your file explorer. If that fails, switching to a different browser like Firefox might be a good option.

If you don't know what that extension does, it's best to remove it! Your browser should be fine, but if anything goes wrong, it's likely that extension was sketchy. Just be cautious when trying to delete it if you can't unregister it easily. Let that thing go!

You can try using the registry on your computer to track down where this extension is installed. There are guides available online that walk you through this process.