Examine source code of MonoTask

{
  "manifest_version": 2,
  "name": "MonoTask",
  "description": "Make firefox into a single tab browser to focus on the task at hand.",
  "version": "0.0.2",
  "icons": {
    "64": "icons/2.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "monotask@tatask.com",
      "strict_min_version": "42.0"
    }
  },
  "browser_action": {
    "default_icon": {
      "64": "icons/2.png"
    },
    "default_title": "MonoTask"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "permissions": [
    "tabs",
    "storage",
    "<all_urls>"
  ]
}