Examine source code of Session Storage

{
  "manifest_version": 2,
  "name": "Session Storage",
  "version": "2.1.1",
  "permissions": [
    "activeTab",
    "tabs",
    "unlimitedStorage",
    "storage"
  ],
  "background": {
    "scripts": [
      "src/engine/Background.js"
    ]
  },
  "icons": {
    "600": "icons/SessionStorageIcon.png"
  },
  "description": "Let's user keep his sessions for future restoration",
  "browser_action": {
    "default_icon": "icons/SessionStorageIcon.png",
    "default_title": "Session Storage",
    "default_popup": "src/popup/Main.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{61249c06-769b-4e48-8ba0-ceaeba5d59d4}"
    }
  }
}