Examine source code of Reddit comment companion

{
  "icons": {
    "16": "icon16.plasmo.2577fc03.png",
    "32": "icon32.plasmo.d583dc1e.png",
    "48": "icon48.plasmo.e0fcfb1d.png",
    "64": "icon64.plasmo.e6259081.png",
    "128": "icon128.plasmo.96a1ede9.png"
  },
  "manifest_version": 3,
  "action": {
    "default_icon": {
      "16": "icon16.plasmo.2577fc03.png",
      "32": "icon32.plasmo.d583dc1e.png",
      "48": "icon48.plasmo.e0fcfb1d.png",
      "64": "icon64.plasmo.e6259081.png",
      "128": "icon128.plasmo.96a1ede9.png"
    }
  },
  "version": "1.2.0",
  "author": "Tim Jonas Meinerzhagen",
  "name": "Reddit comment companion",
  "description": "Show comments for a Reddit post on the overview page",
  "content_scripts": [
    {
      "matches": [
        "*://*.reddit.com/*"
      ],
      "js": [
        "content.41e90f09.js"
      ],
      "css": []
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{7791c252-86af-4ca7-912f-e49d920f219c}"
    }
  },
  "web_accessible_resources": [
    {
      "matches": [
        "*://*.reddit.com/*"
      ],
      "resources": [
        "content.1f071da9.css"
      ]
    }
  ]
}