Examine source code of Clipboard WatchDog

{
  "manifest_version": 2,
  "name": "Clipboard Watchdog",
  "version": "2.1",
  "description": "Warns when websites attempt to access or modify your clipboard",
  "permissions": [
    "activeTab",
    "storage",
    "notifications",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": {
      "48": "icons/icon48.png",
      "96": "icons/icon96.png"
    },
    "default_title": "Clipboard Protector",
    "default_popup": "popup.html"
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "icons": {
    "48": "icons/icon48.png",
    "96": "icons/icon96.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_start"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{7e87d0f4-75b2-45d6-a677-0dce7a209882}"
    }
  }
}