Examine source code of Reddit Logo Hider

{
  "manifest_version": 2,
  "name": "Reddit Logo Hider",
  "version": "1.0",
  "description": "Hides the Reddit logo and icon from the top left on every Reddit page.",
  "content_scripts": [
    {
      "matches": [
        "*://www.reddit.com/*"
      ],
      "css": [
        "hide-logo.css"
      ]
    }
  ],
  "permissions": [],
  "browser_specific_settings": {
    "gecko": {
      "id": "{d09165b8-ee27-482d-80f0-66fd6408ba6d}"
    }
  }
}