Examine source code of WSJ.com remove Opinion

{
  "manifest_version": 2,
  "name": "WSJ.com remove Opinion",
  "version": "1.0",
  "description": "Removes the floating opinion boxes and elements from wsj.com.",
  "content_scripts": [
    {
      "matches": [
        "*://*.wsj.com/*",
        "*://wsj.com/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_end"
    }
  ],
  "permissions": [
    "activeTab"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{7638e8f0-d1c2-4a62-9842-d7689aa068a3}"
    }
  }
}