Message passing - Chrome Developers

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Tue Nov 29 2022 02:50:17 GMT+0000 (Coordinated Universal Time)

chrome.runtime.onMessage.addListener(
  function(request, sender, sendResponse) {
    console.log(sender.tab ?
                "from a content script:" + sender.tab.url :
                "from the extension");
    if (request.greeting === "hello")
      sendResponse({farewell: "goodbye"});
  }
);

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https://developer.chrome.com/docs/extensions/mv3/messaging/#external-webpage

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Message passing - Chrome Developers

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