Examine source code of Page Edit

{
  "name": "Page Edit",
  "description": "An visual editor for HTML elements",
  "version": "1.0.1.2",
  "manifest_version": 2,
  "permissions": [
    "tabs",
    "<all_urls>",
    "storage"
  ],
  "background": {
    "scripts": [
      "/src/background/background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "/src/content/content.js"
      ]
    }
  ],
  "browser_action": {
    "default_title": "Page Edit",
    "default_popup": "/src/popup/popup.html",
    "default_icon": "/images/logo-128.png"
  },
  "icons": {
    "16": "/images/logo-16.png",
    "32": "/images/logo-32.png",
    "48": "/images/logo-48.png",
    "128": "/images/logo-128.png"
  }
}