Examine source code of Rilink

{
  "manifest_version": 2,
  "name": "Rilink",
  "version": "1.0.1",
  "short_name": "Rilink",
  "description": "Shorten long URLs with just one click.",
  "icons": {
    "16": "assets/favicon-16.png",
    "32": "assets/favicon-32.png",
    "48": "assets/favicon-48.png",
    "128": "assets/favicon-128.png"
  },
  "homepage_url": "https://ril.ink",
  "browser_specific_settings": {
    "gecko": {
      "id": "info@ril.ink",
      "strict_min_version": "52.0"
    }
  },
  "author": "rilink",
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "assets/favicon-16.png",
      "32": "assets/favicon-32.png",
      "48": "assets/favicon-48.png",
      "128": "assets/favicon-128.png"
    },
    "default_title": "Shorten this URL",
    "browser_style": false
  },
  "background": {
    "scripts": [
      "js/background.bundle.js"
    ]
  },
  "permissions": [
    "activeTab",
    "storage",
    "clipboardWrite",
    "clipboardRead",
    "http://*/*",
    "https://*/*"
  ],
  "content_security_policy": "script-src 'self' 'unsafe-eval'; object-src 'self'",
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true,
    "browser_style": false
  }
}