Examine source code of Oly Moly

{
  "manifest_version": 2,
  "name": "Oly Moly",
  "version": "1.1.9",
  "browser_specific_settings": {
    "gecko": {
      "id": "{b098c600-6241-430e-933b-bedb2b197c78}"
    }
  },
  "applications": {
    "gecko": {
      "id": "{b098c600-6241-430e-933b-bedb2b197c78}"
    }
  },
  "description": "Download photos from Olympus digital camera.",
  "permissions": [
    "<all_urls>",
    "downloads",
    "storage"
  ],
  "icons": {
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "64": "icons/icon-64.png"
  },
  "background": {
    "scripts": [
      "oly-moly.js"
    ]
  },
  "options_ui": {
    "page": "options.html"
  },
  "browser_action": {
    "default_icon": "icons/icon-48.png"
  }
}