Examine source code of ClipMyStuff Firefox Extension

{
  "manifest_version": 2,
  "name": "ClipMyStuff",
  "description": "This extension will help you to easily add clips to your Clip Playlist or create new Playlist.",
  "version": "0.3resigned1",
  "icons": {
    "16": "images/cmslogo16.png",
    "48": "images/cmslogo48.png",
    "128": "images/cmslogo128.png"
  },
  "browser_action": {
    "default_popup": "index.html",
    "default_icon": "images/cmslogo48.png",
    "default_title": "Clip It!!!"
  },
  "content_scripts": [
    {
      "matches": [
        "https://clipmystuff.com/api/getmytoken/accesstoken/*"
      ],
      "js": [
        "app/contentscript.js"
      ],
      "run_at": "document_end"
    }
  ],
  "applications": {
    "gecko": {
      "id": "anurag06arora@gmail.com",
      "strict_min_version": "48.0"
    }
  },
  "background": {
    "scripts": [
      "app/background.js"
    ]
  },
  "permissions": [
    "storage",
    "activeTab",
    "tabs",
    "https://clipmystuff.com/*"
  ],
  "content_security_policy": "script-src 'self' 'unsafe-eval'; object-src 'self'"
}