Examine source code of ID grabber

{
  "description": "A tool for San Antonio Express-News web producers that grab content IDs.",
  "manifest_version": 2,
  "name": "ID grabber",
  "version": "1.1.1",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": {
      "32": "icons/icon.png"
    }
  },
  "permissions": [
    "clipboardWrite",
    "activeTab"
  ]
}