Examine source code of Image Puzzle Break

{
  "manifest_version": 2,
  "name": "Image Puzzle Break",
  "version": "1.0",
  "description": "Right-click on any image to play a puzzle game with it.",
  "permissions": [
    "contextMenus",
    "activeTab",
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{46e8fe5f-9171-45e3-953b-1683bb39766d}"
    }
  }
}