Examine source code of Bandcamp Shuffle

{
  "manifest_version": 2,
  "name": "Bandcamp Shuffle",
  "version": "1.0",
  "description": "Shuffles the albums in your Bandcamp collection.",
  "icons": {
    "48": "icons/shuffle-48.png",
    "96": "icons/shuffle-96.png"
  },
  "permissions": [
    "activeTab",
    "tabs",
    "storage"
  ],
  "page_action": {
    "default_icon": "icons/shuffle-128.png",
    "browser_style": false,
    "show_matches": [
      "https://*.bandcamp.com/*"
    ]
  },
  "options_ui": {
    "page": "options.html",
    "browser_style": true,
    "chrome_style": true
  },
  "background": {
    "scripts": [
      "index.js"
    ]
  }
}