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{
  ...
  "content_scripts": [
    {
      "js": ["scripts/content.js"],
      "matches": [
        "https://developer.chrome.com/docs/extensions/*",
        "https://developer.chrome.com/docs/webstore/*"
      ]
    }

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"background": {
  "service_worker": "background.js"
  // "scripts": ["jquery.js", "my-background.js"]
},

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{
  "name": "Action Extension",
  ...
  "action": {
    "default_icon": {              // optional
      "16": "images/icon16.png",   // optional
    },
    "default_title": "Click Me",   // optional, shown in tooltip
    "default_popup": "popup.html"  // optional
  },

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// background.js
chrome.action.onClicked.addListener((tab) => {
  chrome.scripting.executeScript({
    target: {tabId: tab.id},
    files: ['content.js']
  });
});

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let changeColor = document.getElementById("changeColor");

changeColor.addEventListener("click", async () => {
  let [tab] = await chrome.tabs.query({ active: true, currentWindow: true });

  chrome.scripting.executeScript({
    target: { tabId: tab.id },
    func: setPageBackgroundColor,
  });
});

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{
  "permissions": [
    "activeTab",
    "tabs"  // 可以 query 到所有 tab 的 url
  ]
}

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changeColor.addEventListener("click", async () => {
  // 撈出指定屬性的 tabs
  let [tab] = await chrome.tabs.query({ active: true, currentWindow: true });

  chrome.scripting.executeScript({
    target: { tabId: tab.id },
    func: () => console.log('do something...'),
  });
});

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chrome.storage.sync.set({ key: value }).then(() => {
  console.log("Value is set to " + value);
});

chrome.storage.sync.get(["key"]).then((result) => {
  console.log("Value currently is " + result.key);
});

// 清除
chrome.storage.local.clear(function() {

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chrome.webRequest.onBeforeRequest.addListener(
  function(details) { return {cancel: true}; },
  {urls: ["*://www.evil.com/*"]},
  ["blocking"]
);

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"permissions": ["webRequest", "storage", "declarativeNetRequest", "declarativeNetRequestFeedback"],
"host_permissions": ["https://*.udemy.com/*"],