Examine source code of Animate!

{
  "manifest_version": 2,
  "name": "Animate!",
  "short_name": "Animate!",
  "version": "0.2.0",
  "description": "Animate the web!",
  "author": "Jackson Clarke",
  "homepage_url": "https://github.com/jdclarke5/animate",
  "icons": {
    "16": "icons/animate-16.png",
    "32": "icons/animate-32.png",
    "48": "icons/animate-48.png",
    "64": "icons/animate-64.png",
    "96": "icons/animate-96.png",
    "128": "icons/animate-128.png"
  },
  "permissions": [
    "activeTab"
  ],
  "browser_action": {
    "default_title": "Animate!"
  },
  "background": {
    "scripts": [
      "browser-polyfill.min.js",
      "background.js"
    ]
  },
  "web_accessible_resources": [
    "content_scripts/sidebar.html"
  ]
}