Examine source code of Heero Video Enhancer

{
  "manifest_version": 3,
  "name": "Heero Video Enhancer",
  "version": "1.9.45",
  "default_locale": "en",
  "author": "[UN]Leash",
  "description": "Customise real-time with Heero, a lightweight and intuitive tool that gives you more control over YouTube and HTML5 videos.",
  "developer": {
    "name": "arrudev"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "heero@unlea.sh",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "icons": {
    "128": "icons/logo-128.png"
  },
  "action": {
    "default_icon": "icons/logo-128.png",
    "default_title": "Heero Enhancer",
    "default_popup": "popup.html"
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "permissions": [
    "storage",
    "contextMenus"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "css/*",
        "icons/*"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "service_worker": "background.js",
    "type": "module"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "modules/fix-webm-duration.js",
        "modules/content-ui.js",
        "modules/sharpening-logic.js",
        "modules/youtube-manager.js",
        "modules/content-logic.js",
        "modules/toolbar-logic.js",
        "modules/download-logic.js",
        "modules/shortcut-logic.js"
      ],
      "css": [
        "css/styles.css"
      ],
      "run_at": "document_idle",
      "all_frames": true,
      "match_about_blank": true
    }
  ]
}