Examine source code of Keanify

{
  "manifest_version": 2,
  "name": "Keanify",
  "description": "Replaces (most) images with breathtaking Keanu",
  "version": "0.1",
  "homepage_url": "https://github.com/caudatecoder/keanify",
  "icons": {
    "48": "icons/keanu-48x48.png",
    "96": "icons/keanu-96x96.png"
  },
  "browser_action": {
    "default_icon": "icons/keanu-32x32.png",
    "default_title": "Keanify"
  },
  "permissions": [
    "activeTab",
    "contextMenus"
  ],
  "background": {
    "scripts": [
      "src/background.js"
    ]
  }
}