Examine source code of FotMob Score Blur

{
  "manifest_version": 2,
  "name": "Frosted Overlay on Fotmob",
  "version": "1.0",
  "description": "Adds a frosted overlay on elements with class='css-1wwsq70-LSMatchStatusScore eoqm9d82'. Click to remove.",
  "icons": {
    "48": "icons/icon-48.png"
  },
  "permissions": [
    "activeTab"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "block-score@fotmob.com",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.fotmob.com/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "browser_action": {
    "default_icon": "icons/icon-48.png"
  }
}