Examine source code of Hudu Extension

{
  "name": "Hudu Assist",
  "description": "Hudu Assist",
  "version": "3.0.6",
  "manifest_version": 3,
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "permissions": [
    "storage",
    "alarms",
    "scripting",
    "activeTab",
    "identity",
    "webRequest",
    "webNavigation"
  ],
  "host_permissions": [
    "https://*/*",
    "<all_urls>"
  ],
  "action": {
    "default_icon": "icon16.png"
  },
  "sidebar_action": {
    "default_panel": "index.html?module=sidePanel",
    "default_title": "Hudu Assist",
    "default_icon": {
      "16": "icon16.png",
      "48": "icon48.png",
      "128": "icon128.png"
    }
  },
  "commands": {
    "_execute_action": {
      "suggested_key": {
        "default": "Ctrl+Shift+I"
      },
      "description": "Open Hudu popup"
    }
  },
  "background": {
    "scripts": [
      "backgroundScript.js"
    ]
  },
  "web_accessible_resources": [
    {
      "resources": [
        "assets/*",
        "scripts/setUpAutofillBtn.js",
        "index.html"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "content_scripts": [
    {
      "css": [
        "contentCSS.css"
      ],
      "all_frames": true,
      "run_at": "document_idle",
      "matches": [
        "<all_urls>"
      ]
    },
    {
      "js": [
        "scripts/mainScript.js"
      ],
      "run_at": "document_idle",
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{342348e9-0e10-4b70-af1f-e83cea7e4284}"
    }
  },
  "content_security_policy": {
    "extension_pages": "object-src 'self'; script-src 'self' 'wasm-unsafe-eval';"
  }
}