Examine source code of Epubespiar - Epub reader

{
  "name": "Epubespiar - Epub reader",
  "version": "0.4.2",
  "manifest_version": 3,
  "description": "Epubespiar is a browser extension that allows you to read EPUB books right in your browser",
  "action": {
    "default_title": "Epubespiar"
  },
  "content_scripts": [
    {
      "matches": [
        "file://*/*",
        "https://*/*"
      ],
      "js": [
        "src/epub-handler.js"
      ],
      "run_at": "document_start",
      "all_frames": false
    }
  ],
  "permissions": [
    "storage",
    "activeTab",
    "downloads"
  ],
  "host_permissions": [
    "file://*/*",
    "https://*/*"
  ],
  "icons": {
    "16": "icon/16.png",
    "32": "icon/32.png",
    "48": "icon/48.png",
    "96": "icon/96.png",
    "128": "icon/128.png"
  },
  "web_accessible_resources": [
    {
      "resources": [
        "reader.html",
        "side_panel.html",
        "assets/*"
      ],
      "matches": [
        "file://*/*",
        "https://*/*"
      ]
    }
  ],
  "content_security_policy": {
    "extension_pages": "script-src 'self'; object-src 'self'; style-src 'self' 'unsafe-inline';"
  },
  "developer": {
    "name": "rezzcode",
    "url": "https://github.com/the1Riddle"
  },
  "background": {
    "scripts": [
      "src/background.js"
    ],
    "type": "module"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "rezzcode@Epubespiar",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}