Examine source code of metafilter-deletedposts

{
  "manifest_version": 2,
  "name": "metafilter-deletedposts",
  "version": "1.2.4",
  "description": "Unofficial Metafilter web extension to show deleted posts.",
  "icons": {
    "48": "icons/icon-48.png",
    "64": "icons/icon-64.png",
    "128": "icons/icon-128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.metafilter.com/"
      ],
      "js": [
        "content/purify.min.js",
        "content/index.js"
      ],
      "css": [
        "content/index.css"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{9c9114ab-3ca8-4cda-816e-bff08e1b8e60}"
    }
  }
}