Chrome extension manifest v3: executing script before website's scripts

[Eugene Bos]

I'm using a content script that receives data from `chrome.storage.local.get` and then executes.

I want it to complete all execution before the website's scripts start executing.

The problem is: that getting data from `chrome.storage.local.get` takes time and is asynchronous, so it starts to execute before the website's scripts but finishes after.

Is there a way to fix it? Like, block the main thread before it finishes or something? Or pass information to it without using `chrome.storage.local.get`? Or should I delay all requests of the page with `chrome.webRequest`?

  "content_scripts": [
    {
      "run_at": "document_start",
      "matches": ["<all_urls>"],
      "js": ["content.js"],
      "match_about_blank" : true
    }
  ],

content.js:
(async () => {
   // website's scripts are not yet executed
   let data = await chrome.storage.local.get("data");
   // website's scripts are already executed
})();

[Jackie Han]

As your own explanation, there is no good way to stop the page code from executing.

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