Examine source code of Flickr Power Users

{
  "manifest_version": 2,
  "name": "Flickr Power Users",
  "short_name": "Flickr Power Users",
  "version": "2.2.5",
  "author": "Accidental Nomad",
  "homepage_url": "https://www.flickr.com/groups/14893261@N24/discuss/",
  "description": "Flickr Extension to get the most out of Flickr for true Fanatics.  Adds extra navigation, download photos, quick comments, html insertion, and other features you have wanted for a while",
  "permissions": [
    "storage",
    "activeTab",
    "https://*.flickr.com/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "content_scripts": [
    {
      "matches": [
        "https://*.flickr.com/*",
        "*://*.flickr.com/photos/upload"
      ],
      "css": [
        "css/fp-dropdown.css"
      ],
      "js": [
        "content_script.js"
      ],
      "all_frames": true,
      "run_at": "document_idle"
    }
  ],
  "options_page": "options.html",
  "browser_action": {
    "default_icon": {
      "16": "icons/icon-16.png",
      "32": "icons/icon-32.png",
      "48": "icons/icon-48.png"
    },
    "default_title": "Flickr Power Users",
    "default_popup": "popup.html"
  },
  "icons": {
    "16": "icons/icon-16.png",
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "id@mailboxrelay.com",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}