Examine source code of FantraxBaseball+

{
  "manifest_version": 3,
  "name": "FantraxBaseball+",
  "version": "1.6.7",
  "description": "Adds Statcast, MLB Video, and live MLB.tv links to Fantrax fantasy baseball players",
  "permissions": [
    "declarativeNetRequest",
    "storage",
    "webRequest",
    "webRequestBlocking"
  ],
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "48": "icons/icon-48.png",
      "96": "icons/icon-96.png"
    }
  },
  "host_permissions": [
    "*://*.fantrax.com/*",
    "https://fastball-gateway.mlb.com/*",
    "https://statsapi.mlb.com/*",
    "https://fastball-clips.mlb.com/*",
    "https://baseballsavant.mlb.com/*",
    "https://www.fangraphs.com/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "declarative_net_request": {
    "rule_resources": [
      {
        "id": "ruleset_1",
        "enabled": true,
        "path": "rules.json"
      }
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.fantrax.com/*"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "content.css"
      ],
      "run_at": "document_idle"
    }
  ],
  "icons": {
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{a11967e0-f95a-4685-8456-2aaa056e3c7e}",
      "strict_min_version": "128.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  }
}