Examine source code of Optimism for Reddit

{
  "manifest_version": 3,
  "name": "Optimism",
  "version": "1.0",
  "icons": {
    "48": "icons/icon48.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "optimism@dsaditya.com",
      "strict_min_version": "58.0"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "*://www.reddit.com/r/*"
      ],
      "js": [
        "bundle.js"
      ]
    }
  ]
}