devtools.inspectedWindow in the context of MV3 extension's service worker

[ka...@couponfollow.com]

I'm trying to create devtools extension that would add a new panel to devtools window opened in the context of an MV3 extension's service worker. 

So when you go to chrome://extensions, click the Service Worker link of your extension, open DevTools, I'd like to add a new panel and display some data from the inspected extension. For example, it's storage or manifest, or whatever.

The goal is to have a generic extension, so I don't want to communicate directly between extensions, I want to open my devtools extension in the context of any installed extension.

I started with the following manifest:

{

  "manifest_version": 3,

  ...

  "permissions": ["<all_urls>", "scripting", "tabs"],

  "devtools_page": "devtools.html",

  "background": {

    "service_worker": "background.js"

  },

}

end the devtools.html simply creates a panel, which runs the following script:

function evalInWindow(fn) {

  chrome.devtools.inspectedWindow.eval(

    "(" + fn.toString() + ")(chrome)",

    (value, isError) => {

      if (isError) {

        console.error(value);

      } else {

        console.log(value);

      }

    }

  );

}

evalInWindow(function (chrome) {

  console.log(chrome.runtime.getManifest()); // I expect the manifest of the inspected extension being logged here

  return "my string";

});

This doesn't work against MV3 extension, but works perfectly against MV2 extensions.

For MV3-based ones I get "Extension server error: Object not found: <top>" error.

I tried to execute a script:

chrome.scripting.executeScript(

  {

    func: () => {

      console.log("Injected script");

      return "injected script";

    },

    target: {

      tabId: -1, // no idea what ID to use here...

    },

  },

  function (result) {

    console.log(result);

  }

);

Doesn't work either. The TabId is the issue probably, I tried -1, 0, 1 etc but I get "Unchecked runtime.lastError: No tab with id: -1" and "evaluate: the main frame is not yet available".

Is there an API or any other way to create such an extension?

Best,

Kamil

[wOxxOm]

This API doesn't support workers.