Examine source code of X Badge Filter

{
  "manifest_version": 2,
  "name": "__MSG_extensionName__",
  "version": "2.0.0",
  "description": "__MSG_extensionDescription__",
  "default_locale": "ja",
  "author": "kimkimjp",
  "icons": {
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png",
    "128": "icons/icon-128.png"
  },
  "permissions": [
    "storage"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://x.com/*",
        "*://twitter.com/*",
        "*://mobile.x.com/*",
        "*://mobile.twitter.com/*"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "styles.css"
      ],
      "run_at": "document_idle"
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": {
      "48": "icons/icon-48.png",
      "96": "icons/icon-96.png"
    },
    "default_title": "__MSG_extensionName__",
    "default_popup": "popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "x-badge-filter@ultrathink.jp",
      "strict_min_version": "109.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    },
    "gecko_android": {
      "strict_min_version": "120.0"
    }
  }
}