Examine source code of Reddit MTG Card Hover

{
  "name": "Reddit MTGCardFetcher Hover",
  "version": "2.1.5",
  "short_name": "Reddit MTGCard Hover",
  "description": "Shows the card image after mouse hover for MTGCardFetcher bot on Reddit.",
  "manifest_version": 3,
  "permissions": [
    "storage"
  ],
  "host_permissions": [
    "*://www.reddit.com/*",
    "*://old.reddit.com/*"
  ],
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "action": {
    "default_icon": "icons/default-icon.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://www.reddit.com/*",
        "*://old.reddit.com/*"
      ],
      "run_at": "document_end",
      "js": [
        "src/index.js"
      ],
      "all_frames": true
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "src/cardHover.css"
      ],
      "matches": [
        "*://www.reddit.com/*",
        "*://old.reddit.com/*"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{93e78c5a-bea8-4495-a6e8-4e3e4fb5ee31}",
      "strict_min_version": "109.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}