Examine source code of nurl.ng

{
  "manifest_version": 2,
  "name": "nurl.ng",
  "version": "1.1.2resigned1",
  "description": "Nigeria's premiere URL shortening service",
  "homepage_url": "https://nurl.ng",
  "developer": {
    "name": "Rowland Ogwara",
    "url": "https://nurl.ng"
  },
  "icons": {
    "48": "src/icons/mdpi.png",
    "96": "src/icons/xhdpi.png"
  },
  "applications": {
    "gecko": {
      "id": "nurl@nimworks.com"
    }
  },
  "browser_action": {
    "browser_style": true,
    "default_icon": {
      "19": "src/icons/mdpi.png",
      "38": "src/icons/mdpi.png"
    },
    "default_title": "Shorten and Share this URL",
    "default_popup": "src/pages/popup.html"
  },
  "background": {
    "page": "src/pages/background.html",
    "persistent": false
  },
  "permissions": [
    "activeTab",
    "contextMenus",
    "storage",
    "notifications",
    "clipboardWrite",
    "<all_urls>"
  ]
}