Examine source code of RocketRead

{
  "manifest_version": 3,
  "name": "RocketRead",
  "version": "1.0.2",
  "author": "silveryar",
  "description": "Read through web pages with rocket speed",
  "icons": {
    "16": "icon-16.png",
    "32": "icon-32.png",
    "48": "icon-48.png",
    "128": "icon-128.png"
  },
  "action": {
    "default_title": "RocketRead",
    "default_icon": {
      "16": "icon-16.png",
      "32": "icon-32.png"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "type": "module"
  },
  "permissions": [
    "storage",
    "activeTab",
    "tabs",
    "contextMenus",
    "scripting"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "rocketread@silveryar.cc",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "commands": {
    "launch-reader": {
      "suggested_key": {
        "default": "Ctrl+Alt+P",
        "mac": "Command+Alt+P"
      },
      "description": "Launch RocketRead with selected text or full page"
    }
  },
  "content_security_policy": {
    "extension_pages": "script-src 'self'; object-src 'self'"
  }
}