Examine source code of Shorten & Copy Tabs

{
  "manifest_version": 2,
  "name": "Shorten & Copy Tabs",
  "version": "1.0",
  "description": "Collects all open tabs, shortens their URLs via TinyURL and copies \"\"short_url\" - Page Title\" lines to the clipboard.",
  "permissions": [
    "tabs",
    "clipboardWrite",
    "<all_urls>"
  ],
  "browser_action": {
    "default_title": "Shorten & Copy Tabs",
    "default_popup": "popup.html",
    "default_icon": {
      "64": "icon64.png",
      "128": "icon128.png"
    }
  },
  "icons": {
    "64": "icon64.png",
    "128": "icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{12d66597-7db3-4199-8146-a72fc696ddd5}",
      "strict_min_version": "101.0"
    }
  }
}