Examine source code of Extension

{
  "manifest_version": 2,
  "name": "Extension",
  "version": "4.12.9",
  "description": "Live football (soccer) scores in the United States — MLS and more",
  "browser_specific_settings": {
    "gecko": {
      "id": "live-us-football-scores@scorelivesus.com",
      "strict_min_version": "109.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "https://site.api.espn.com/*"
  ],
  "icons": {
    "16": "icons/icon-16.png",
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  },
  "browser_action": {
    "default_icon": {
      "16": "icons/icon-16.png",
      "32": "icons/icon-32.png",
      "48": "icons/icon-48.png",
      "128": "icons/icon-128.png"
    },
    "default_title": "Live US Football Scores",
    "default_popup": "popup.html"
  },
  "options_ui": {
    "page": "options.html"
  }
}