Examine source code of Bly.to Link Shortener

{
  "manifest_version": 2,
  "version": "1.0.1",
  "name": "Bly.to Link Shortener",
  "short_name": "Bly.to",
  "description": "Ultimate link shortener to create instant FREE short links from your browser",
  "homepage_url": "https://bly.to",
  "author": "Muhammad Ovi",
  "browser_action": {
    "default_icon": "root-assets/img/icons/x32.png",
    "default_title": "Bly.to Link Shortener",
    "default_popup": "popup/index.html"
  },
  "icons": {
    "16": "root-assets/img/icons/x16.png",
    "32": "root-assets/img/icons/x32.png",
    "48": "root-assets/img/icons/x48.png",
    "128": "root-assets/img/icons/x128.png"
  },
  "permissions": [
    "storage",
    "activeTab",
    "contextMenus",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "root-assets/js/background-script.js"
    ],
    "persistent": false
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{bb9a057e-0193-4dd3-a30b-254751ba1954}"
    }
  }
}