Examine source code of SuttaCentral Redirect

{
  "manifest_version": 3,
  "name": "SuttaCentral Redirect",
  "version": "1.4.0",
  "description": "Toggle between suttacentral.net and .now or .express",
  "permissions": [
    "storage",
    "activeTab",
    "declarativeNetRequest"
  ],
  "host_permissions": [
    "*://suttacentral.net/*",
    "*://suttacentral.express/*",
    "*://suttacentral.now/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "@suttacentral-redirect",
      "strict_min_version": "58.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icon16.png",
      "32": "icon32.png",
      "48": "icon48.png",
      "128": "icon128.png"
    }
  },
  "icons": {
    "16": "icon16.png",
    "32": "icon32.png",
    "48": "icon48.png",
    "128": "icon128.png"
  }
}