Examine source code of Flickr Photos In New Tab

{
  "manifest_version": 2,
  "name": "Flickr Photos In New Tab",
  "version": "1.6",
  "description": "Replaces Firefox New Tab with photos from a Flickr album, Explore or Search",
  "icons": {
    "48": "icons/flickr-tab-frog-3.png"
  },
  "chrome_url_overrides": {
    "newtab": "flickrtab.html"
  },
  "homepage_url": "https://github.com/mendhak/firefox-mendhak-flickr",
  "permissions": [
    "storage"
  ],
  "options_ui": {
    "page": "options.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{0d92d791-1db2-4181-a017-f309b99a620c}"
    }
  }
}