Examine source code of DLMan

{
  "manifest_version": 2,
  "name": "DLMan - Download Manager",
  "description": "Intercept browser downloads and send them to DLMan desktop app for faster, resumable downloads with queue management.",
  "version": "1.9.2",
  "icons": {
    "16": "icon/16.png",
    "32": "icon/32.png",
    "48": "icon/48.png",
    "128": "icon/128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "dlman@ideyenovin.gmail.com",
      "strict_min_version": "109.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "storage",
    "downloads",
    "contextMenus",
    "notifications",
    "activeTab",
    "clipboardRead",
    "alarms",
    "cookies",
    "http://localhost:*/*",
    "ws://localhost:*/*",
    "<all_urls>"
  ],
  "web_accessible_resources": [
    "icon/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "DLMan",
    "default_popup": "popup.html"
  },
  "options_ui": {
    "page": "options.html"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "run_at": "document_idle",
      "js": [
        "content-scripts/content.js"
      ]
    }
  ]
}