explanationManifest.js

const jsonSettingsManifest = {
  name: "__MSG_name__", // "__MSG_name__" - dynamic value takes name from _locales/{lang}/message.json folder
  version: "1.0.0",
  manifest_version: 3, // the newest version is 3
  default_locale: "en", // by default extension is on english
  description: "__MSG_description__", // "__MSG_description__" - dynamic value takes description from _locales/{lang}/message.json folder
  icons: {
    32: "./icons/copypaste-32.png", // 32x32 icon
    64: "./icons/copypaste-64.png", // 64x64 icon
    128: "./icons/copypaste-128.png", // 128x128 icon
  },
  content_scripts: [
    {
      matches: ["https://stackoverflow.com/*"], // enables extension on all stackoverflow pages
      run_at: "document_idle", // "document_idle" run after page and all sources(js, css..) is loaded
      all_frames: false, // not insert script in iframe tag
      js: ["./content-script.js"], // paths for our scripts
    },
  ],
  permissions: ["storage"], // enable storage (similar to local/session storage)
  host_permissions: ["https://stackoverflow.com/*"], // tell browser with what sites we want to work, if add ["https://stackoverflow.com/*" <all_url>] will enable permission for all sites(aggressive permission)
  web_accessible_resources: [
    // add an ability to add local resources (our css, icons etc.)
    {
      resources: ["content_script.css", "execute.js"], // resources to add
      matches: ["https://stackoverflow.com/*"], // where to add the resource (place)
    },
  ],
  commands: {
    // add a new "copy-all" command on alt+c key
    "copy-all": {
      suggested_key: {
        default: "Alt+C",
      },
      description: "Copy all text",
    },
  },
  background: {
    service_worker: "background.js", // run background.js script for copy-all functionality
  },

  // can add template to new tab, currently no using this
  chrome_url_overrides: {
    newtab: "new_tab.html",
  },
};