Examine source code of Search Shortcut Manager

{
  "manifest_version": 2,
  "name": "Search Shortcut Manager",
  "version": "1.0",
  "description": "Use custom search shortcuts like @yt cats or @ddg fetch.",
  "permissions": [
    "storage",
    "tabs"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_icon": "icons/icon64.png",
    "default_popup": "popup.html",
    "default_title": "Search Shortcut Manager"
  },
  "icons": {
    "64": "icons/icon64.png",
    "128": "icons/icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{dfe9b361-401e-43e9-87b0-0938e52c74b8}",
      "strict_min_version": "96.0"
    }
  }
}