Examine source code of New Reddit comment faces

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manifest.json
{
  "manifest_version": 2,
  "name": "New Reddit comment faces",
  "version": "1.2.0",
  "description": "Renders comment faces, spoiler codes, and other old Reddit CSS hacks on new Reddit.",
  "author": "eritbh",
  "icons": {
    "96": "icon96.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "new-reddit-comment-faces@eritbh.me"
    }
  },
  "permissions": [
    "https://*.reddit.com/*"
  ],
  "content_scripts": [
    {
      "run_at": "document_start",
      "matches": [
        "https://www.reddit.com/*",
        "https://new.reddit.com/*"
      ],
      "js": [
        "temp.js",
        "messaging-1b976b1d.js",
        "contentScript.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "temp.js",
      "messaging-1b976b1d.js",
      "background.js"
    ]
  }
}