Examine source code of Amazon Smart Viewer

{
  "manifest_version": 2,
  "name": "Amazon Smart Viewer",
  "version": "1.2",
  "icons": {
    "64": "photo/ff-logo.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "smart_viewer.js"
      ],
      "css": [
        "smart_viewer.css"
      ]
    }
  ],
  "background": {
    "scripts": [
      "ignore_frame.js"
    ]
  },
  "web_accessible_resources": [
    "photo/*.png",
    "photo/*.svg"
  ],
  "permissions": [
    "storage",
    "webRequest",
    "webRequestBlocking",
    "<all_urls>"
  ],
  "applications": {
    "gecko": {
      "strict_min_version": "64.0"
    }
  }
}