Examine source code of Mindful Browsing

{
  "manifest_version": 2,
  "name": "Mindful Browsing",
  "version": "1.0",
  "description": "Prevent mindless browsing by requiring a deliberate action before accessing distracting websites",
  "permissions": [
    "storage",
    "webNavigation",
    "tabs"
  ],
  "browser_action": {
    "default_popup": "popup.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{61f34a3b-735a-486f-99a6-5965b643718c}"
    }
  }
}