Examine source code of Top Convos

{
  "name": "Top Convos",
  "description": "Counts Facebook messages.",
  "version": "2.0.4",
  "author": "RAF5UN",
  "homepage_url": "https://www.facebook.com/rafsun82",
  "applications": {
    "gecko": {
      "id": "{c80573b5-3c55-4d44-9f15-5ac9b73b978d}"
    }
  },
  "browser_action": {
    "default_icon": {
      "16": "img/logo/logo-icon-16.png",
      "24": "img/logo/logo-icon-24.png",
      "32": "img/logo/logo-icon-32.png",
      "48": "img/logo/logo-icon-48.png",
      "64": "img/logo/logo-icon-64.png",
      "96": "img/logo/logo-icon-96.png",
      "128": "img/logo/logo-icon-128.png",
      "256": "img/logo/logo-icon-256.png"
    }
  },
  "icons": {
    "16": "img/logo/logo-icon-16.png",
    "24": "img/logo/logo-icon-24.png",
    "32": "img/logo/logo-icon-32.png",
    "48": "img/logo/logo-icon-48.png",
    "64": "img/logo/logo-icon-64.png",
    "96": "img/logo/logo-icon-96.png",
    "128": "img/logo/logo-icon-128.png",
    "256": "img/logo/logo-icon-256.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "tabs",
    "webRequest",
    "webRequestBlocking",
    "*://dl.dropboxusercontent.com/*",
    "*://www.facebook.com/*",
    "https://api.cloudinary.com/"
  ],
  "manifest_version": 2,
  "content_security_policy": "script-src 'self' 'unsafe-eval'; object-src 'self';"
}