Examine source code of Launchpad Tweaks

{
  "manifest_version": 2,
  "name": "Launchpad Tweaks",
  "description": "Tweaks the appearance of the Launchpad website to make it easier to use",
  "version": "1.1resigned1",
  "icons": {
    "128": "icons/launchpad_tweaks_128.png"
  },
  "permissions": [
    "https://*.launchpad.net/*",
    "http://*.launchpad.net/*"
  ],
  "content_scripts": [
    {
      "css": [
        "css/launchpad_tweaks.css"
      ],
      "matches": [
        "https://*.launchpad.net/*",
        "http://*.launchpad.net/*"
      ],
      "run_at": "document_end"
    }
  ],
  "update_url": "https://clients2.google.com/service/update2/crx",
  "browser_specific_settings": {
    "gecko": {
      "id": "{cfb58521-e3e6-4fdb-a216-f13ba544ccca}"
    }
  }
}