Examine source code of Better xkcd

{
  "name": "Better xkcd",
  "description": "An alternative xkcd viewer, optimized for browsing them mindlessly!",
  "version": "1.0.0",
  "manifest_version": 2,
  "content_scripts": [
    {
      "matches": [
        "https://xkcd.com/*"
      ],
      "js": [
        "src/fullscreen/buttons.js",
        "src/fullscreen/viewer.js"
      ],
      "css": [
        "src/fullscreen/fullscreenComic.css",
        "src/fullscreen/button.css"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{4c47993e-eaa0-43fc-a0c1-155d19977ee6}"
    }
  }
}