'chrome.webRequest.onBeforeSendHeaders.addListener() manifest_version:3

want an example chrome.webRequest.onBeforeSendHeaders.addListener() in [manifest_version:3],to change requestHeaders

chrome.webRequest.onBeforeSendHeaders.addListener(
(details) => {

    return { requestHeaders: details.requestHeaders };
},
{ urls: ["<all_urls>"] },
["blocking", "requestHeaders", "extraHeaders"]);


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