Examine source code of Scroll Custom

{
  "manifest_version": 2,
  "name": "Scroll Custom",
  "version": "1.0",
  "description": "Scroll slowly to read paragraphs, adjust speed",
  "permissions": [
    "storage",
    "<all_urls>",
    "declarativeNetRequestWithHostAccess"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icon.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    },
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content_script.js"
      ],
      "run_at": "document_start",
      "all_frames": true
    }
  ],
  "web_accessible_resources": [
    "styles.css"
  ],
  "icons": {
    "48": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{94cae37b-a67f-467b-bd33-7f8d461dccb9}"
    }
  }
}