Examine source code of Reddit Hide Promoted

{
  "manifest_version": 2,
  "name": "Reddit Hide Promoted",
  "version": "1.0.0.1resigned1",
  "content_scripts": [
    {
      "js": [
        "js/content_script.js"
      ],
      "matches": [
        "*://www.reddit.com/*"
      ],
      "all_frames": true,
      "run_at": "document_start"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{8c884b4c-1f63-4e2e-a707-a3900439f4fe}"
    }
  }
}