Examine source code of Last.fm Recent Tracks

{
  "manifest_version": 2,
  "name": "Last.fm Recent Tracks",
  "version": "1.0.2",
  "description": "Show recent tracks for Last.fm users.",
  "icons": {
    "48": "logo/ff-lastfm-recenttracks_48px.png",
    "96": "logo/ff-lastfm-recenttracks_96px.png"
  },
  "permissions": [
    "storage",
    "alarms"
  ],
  "background": {
    "scripts": [
      "scripts/background.js"
    ]
  },
  "chrome_url_overrides": {
    "newtab": "newtab.html"
  },
  "options_ui": {
    "page": "options.html",
    "browser_style": true
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{e60dd91e-4642-4a35-9acf-f3b3f92234f1}"
    }
  }
}