Examine source code of Email Lookup Assistant

{
  "manifest_version": 2,
  "name": "Email Lookup Assistant",
  "version": "0.2.0",
  "description": "",
  "icons": {
    "64": "mail.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "contextMenus",
    "tabs",
    "<all_urls>"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{f4f374c8-32ae-4313-870f-1e48f8888389}"
    }
  }
}