Examine source code of Mute-a-Filter

{
  "manifest_version": 2,
  "name": "Mute-a-Filter",
  "version": "0.7resigned1",
  "description": "A filter for MetaFilter comments.",
  "author": "Emanuel Feld",
  "background": {
    "scripts": [
      "js/background.js"
    ]
  },
  "content_scripts": [
    {
      "js": [
        "js/index.js"
      ],
      "matches": [
        "https://*.metafilter.com/*"
      ],
      "run_at": "document_end"
    }
  ],
  "web_accessible_resources": [
    "js/index.js"
  ],
  "permissions": [
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{67e902cc-4867-4c35-bc80-43fad1c50383}"
    }
  }
}