Examine source code of Continuous Scroll

{
  "manifest_version": 2,
  "name": "Continuous Scroll",
  "version": "1.0",
  "description": "Scroll continuously with arrow keys",
  "icons": {
    "48": "icon.svg",
    "96": "icon.svg"
  },
  "permissions": [
    "activeTab",
    "storage",
    "<all_urls>"
  ],
  "browser_action": {
    "default_icon": "icon.svg",
    "default_title": "Continuous Scroll",
    "default_popup": "./index.html"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "./script.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{6823db70-cadf-4a65-8d11-b7c49c0f94f4}"
    }
  }
}