Examine source code of Fast image viewer of images loaded in a page

{
  "manifest_version": 2,
  "name": "Image reader",
  "version": "1.2.2resigned1",
  "description": "Show all images from the webpage easly",
  "author": "VZenix <info@vzenix.es>",
  "permissions": [
    "activeTab",
    "contextMenus",
    "storage"
  ],
  "icons": {
    "32": "icons/logo-32.png",
    "48": "icons/logo-48.png",
    "64": "icons/logo-64.png",
    "128": "icons/logo-128.png",
    "256": "icons/logo-256.png"
  },
  "browser_action": {
    "default_icon": {
      "32": "icons/logo-32.png",
      "48": "icons/logo-48.png",
      "64": "icons/logo-64.png",
      "128": "icons/logo-128.png",
      "256": "icons/logo-256.png"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "all_frames": false,
      "match_about_blank": true,
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "run_at": "document_idle",
      "js": [
        "index.js"
      ]
    }
  ],
  "options_ui": {
    "page": "config/home.html",
    "open_in_tab": true
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{60eba755-1a44-4224-8ee5-4504687760a0}"
    }
  }
}