Examine source code of PopupKiller

{
  "manifest_version": 2,
  "name": "PopupKiller",
  "version": "1.4resigned1",
  "description": "On page load, compares URL to a user-created list. Closes page/tab if there is a match.",
  "homepage_url": "https://github.com",
  "icons": {
    "32": "icons/PKv4-32.png",
    "48": "icons/PKv4-48.png",
    "96": "icons/PKv4-96.png"
  },
  "permissions": [
    "tabs",
    "activeTab",
    "storage"
  ],
  "browser_action": {
    "default_icon": "icons/PKv4-32.png",
    "default_title": "Edit Kill-List",
    "default_popup": "popup/edit_list.html"
  },
  "background": {
    "scripts": [
      "chrome-compat/browser-polyfill.js",
      "background/popupkiller.js"
    ]
  },
  "options_ui": {
    "page": "options/options.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{489be7e4-7840-452e-bae7-a5b69ea57b8b}"
    }
  }
}