Examine source code of Autofill Powerlevel 9000

{
  "manifest_version": 2,
  "name": "Autofill Powerlevel 9000",
  "version": "1.3.0",
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "main.js"
      ],
      "all_frames": true
    }
  ],
  "permissions": [
    "storage",
    "unlimitedStorage",
    "tabs"
  ],
  "icons": {
    "48": "48icon.png",
    "96": "96icon.png"
  },
  "browser_action": {
    "browser_style": true,
    "default_icon": {
      "16": "16icon.png",
      "32": "32icon.png"
    },
    "default_title": "Autofill Powerlevel 9000",
    "default_popup": "index.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{b9a669eb-432e-4345-b1e9-f981c4cc9c1f}"
    }
  }
}