Examine source code of Duoblock Origin

{
  "manifest_version": 3,
  "name": "Duoblock Origin",
  "version": "1.1",
  "description": "A lightweight adblocker for Duolingo.",
  "permissions": [
    "storage",
    "tabs"
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "modes/hard-block.js",
        "modes/soft-block.js",
        "modes/extreme-block.js"
      ],
      "matches": [
        "https://*.duolingo.com/*",
        "https://*.duolingo.cn/*",
        "https://raw.githubusercontent.com/*"
      ]
    }
  ],
  "icons": {
    "16": "images/icon-16.png",
    "48": "images/icon-48.png",
    "128": "images/icon-128.png",
    "256": "images/icon-256.png",
    "512": "images/icon-512.png"
  },
  "action": {
    "default_title": "Duoblock Origin",
    "default_popup": "popup.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "https://*.duolingo.com/*",
        "https://*.duolingo.cn/*",
        "https://raw.githubusercontent.com/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_start"
    }
  ],
  "options_page": "options.html",
  "browser_specific_settings": {
    "gecko": {
      "id": "{9a46ec17-f439-494a-9e72-43692c969244}",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}