Examine source code of Limite

{
  "manifest_version": 2,
  "name": "Limite",
  "version": "2.2",
  "author": "Saverio Morelli (Sav22999)",
  "description": "Check how much time you spend on each website every day.\nOptimise your productivity, your time and your life as well.\nDon't lose precious time!",
  "icons": {
    "16": "./img/icon-16.png",
    "24": "./img/icon-24.png",
    "48": "./img/icon-48.png",
    "96": "./img/icon-96.png"
  },
  "applications": {
    "gecko": {
      "id": "limite@saveriomorelli.com"
    }
  },
  "browser_action": {
    "browser_style": true,
    "default_icon": {
      "16": "./img/icon-16.png",
      "24": "./img/icon-24.png",
      "48": "./img/icon-48.png",
      "96": "./img/icon-96.png"
    },
    "theme_icons": [
      {
        "dark": "./img/icon-16.png",
        "light": "./img/icon-16.png",
        "size": 16
      },
      {
        "dark": "./img/icon-24.png",
        "light": "./img/icon-24.png",
        "size": 24
      },
      {
        "dark": "./img/icon-48.png",
        "light": "./img/icon-48.png",
        "size": 48
      },
      {
        "dark": "./img/icon-96.png",
        "light": "./img/icon-96.png",
        "size": 96
      }
    ],
    "default_title": "Limite",
    "default_popup": "./popup.html"
  },
  "background": {
    "scripts": [
      "./js/background.js"
    ],
    "persistent": true
  },
  "permissions": [
    "storage",
    "tabs",
    "unlimitedStorage",
    "notifications",
    "activeTab",
    "<all_urls>"
  ]
}