Examine source code of Inspectre

{
  "manifest_version": 2,
  "name": "Inspectre",
  "version": "1.0.1",
  "description": "Debug page layout with CSS outlines.",
  "author": "Sourav Singh",
  "browser_action": {
    "browser_style": false,
    "default_area": "navbar",
    "default_icon": {
      "16": "img/logo.svg",
      "32": "img/logo.svg",
      "64": "img/logo.svg"
    },
    "default_title": "Show Outlines"
  },
  "icons": {
    "16": "img/logo.svg",
    "32": "img/logo.svg",
    "48": "img/logo.svg",
    "64": "img/logo.svg",
    "96": "img/logo.svg",
    "128": "img/logo.svg"
  },
  "permissions": [
    "activeTab",
    "tabs"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{f17dd92a-8c87-48d2-82fa-b855102e0b3e}"
    }
  }
}