Examine source code of Realize

{
  "manifest_version": 2,
  "name": "Realize",
  "version": "1.0.0.0",
  "icons": {
    "16": "16.png",
    "32": "32.png",
    "48": "48.png",
    "128": "128.png"
  },
  "permissions": [
    "activeTab",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "web_accessible_resources": [
    "hook.js"
  ],
  "devtools_page": "devtools-root.html"
}