Examine source code of Darker Medium

{
  "name": "Darker Medium",
  "version": "1.4.1resigned1",
  "description": "Read Medium stories with happy eyes",
  "author": "Rob Garrison",
  "manifest_version": 2,
  "homepage_url": "http://github.com/Mottie/Darker-Medium",
  "permissions": [
    "storage",
    "tabs",
    "<all_urls>"
  ],
  "browser_action": {
    "default_icon": {
      "16": "icons/icon16.png",
      "19": "icons/icon19.png",
      "32": "icons/icon32.png",
      "38": "icons/icon38.png"
    }
  },
  "content_scripts": [
    {
      "js": [
        "js/content.js"
      ],
      "matches": [
        "<all_urls>"
      ],
      "all_frames": true,
      "run_at": "document_start"
    }
  ],
  "background": {
    "scripts": [
      "js/settings.js",
      "js/background.js"
    ]
  },
  "web_accessible_resources": [
    "style.css",
    "gist.css"
  ],
  "commands": {
    "disable-darker-medium": {
      "description": "Toggle Darker Medium"
    }
  },
  "icons": {
    "16": "icons/icon16.png",
    "19": "icons/icon19.png",
    "32": "icons/icon32.png",
    "38": "icons/icon38.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "options_ui": {
    "page": "options/options.html",
    "chrome_style": true
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{d4681969-2cee-4235-a869-cbd44764378c}"
    }
  }
}