Examine source code of Emoji Sprinkler

{
  "manifest_version": 2,
  "name": "Emoji Sprinkler",
  "version": "2.2.1.4",
  "description": "Give web pages a cheerful upgrade by sprinkling relevant emoji after keywords such as pizza, music, star and more. Dial the amount up or down with a slider and revert to the original whenever you like.",
  "icons": {
    "32": "assets/icon-32.png",
    "48": "assets/icon-48.png",
    "64": "assets/icon-64.png",
    "96": "assets/icon-96.png",
    "128": "assets/icon-128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{9c500eb5-1e38-467a-a2c3-692da0397cb8}",
      "strict_min_version": "101.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "activeTab"
  ],
  "browser_action": {
    "default_title": "Emoji Sprinkler",
    "default_popup": "app/popup.html",
    "default_icon": {
      "32": "assets/icon-32.png",
      "48": "assets/icon-48.png",
      "64": "assets/icon-64.png"
    }
  }
}