Examine source code of XKCD Explainer

{
  "manifest_version": 2,
  "name": "XKCD Explainer",
  "version": "1.1resigned1",
  "description": "Adds a button to every XKCD webcomic that links to the relevant page in explainxkcd.",
  "content_scripts": [
    {
      "matches": [
        "*://*.xkcd.com/*"
      ],
      "js": [
        "explain_xkcd.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{eb72a218-9d4f-4ce0-8d6e-ad2204767c9b}"
    }
  }
}