Examine source code of ng-inspect

{
  "manifest_version": 2,
  "name": "ng-inspect",
  "description": "Inspect the angular scope",
  "version": "1.1resigned1",
  "permissions": [
    "contextMenus",
    "tabs",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "main.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "injectscript.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "jid1-v6jvJrqACQCakw@jetpack"
    }
  }
}