Messenger Dark Mode

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 2,
  "name": "Messenger Dark Mode",
  "description": "Changes the color scheme of messenger.com",
  "version": "1.1",
  "icons": {
    "16": "images/icon16.png",
    "48": "images/icon48.png",
    "128": "images/icon128.png",
    "256": "images/icon256.png",
    "512": "images/icon512.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.messenger.com/*"
      ],
      "css": [
        "darkMode.css"
      ],
      "run_at": "document_end"
    }
  ]
}