Examine source code of BookEdge

{
  "manifest_version": 2,
  "name": "BookEdge",
  "description": "BookEdge the ADVANCED Amazon Author Reporting Tool",
  "version": "1.9",
  "browser_action": {},
  "icons": {
    "16": "icon-16.png",
    "48": "icon-48.png",
    "128": "icon-128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.bookedge.local/*",
        "*://bookedge.local/*",
        "*://bookedge.co/*",
        "*://*.bookedge.co/*"
      ],
      "js": [
        "contentScript.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "web_accessible_resources": [
    "beInject.js"
  ],
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "storage",
    "cookies",
    "*://*.bookedge.local/*",
    "*://*.bookedge.co/*",
    "*://*.amazon.com/*"
  ],
  "optional_permissions": [
    "*://*.amazon.co.uk/*",
    "*://*.amazon.de/*",
    "*://*.amazon.fr/*",
    "*://*.amazon.co.jp/*",
    "*://*.amazon.com.au/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{d7889d7e-3886-4399-b07e-1770e8cd7144}"
    }
  }
}