Examine source code of Download with Free Download Manager (FDM)

{
  "manifest_version": 3,
  "name": "Download with Free Download Manager (FDM)",
  "description": "__MSG_description__",
  "default_locale": "en",
  "version": "0.3.5",
  "homepage_url": "https://webextension.org/listing/download-with.html?from=fdm",
  "permissions": [
    "storage",
    "nativeMessaging",
    "notifications",
    "downloads",
    "contextMenus",
    "activeTab",
    "scripting"
  ],
  "optional_host_permissions": [
    "*://*/*"
  ],
  "action": {},
  "background": {
    "service_worker": "worker.js",
    "scripts": [
      "utils/termlib_parser.js",
      "context.js",
      "worker.js"
    ]
  },
  "icons": {
    "16": "data/icons/16.png",
    "32": "data/icons/32.png",
    "48": "data/icons/48.png",
    "64": "data/icons/64.png",
    "128": "data/icons/128.png",
    "256": "data/icons/256.png",
    "512": "data/icons/512.png"
  },
  "web_accessible_resources": [
    {
      "resources": [
        "data/grab/index.html"
      ],
      "matches": [
        "*://*/*"
      ]
    }
  ],
  "options_ui": {
    "page": "data/options/index.html",
    "open_in_tab": true
  },
  "commands": {
    "_execute_action": {}
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{1fb1ffdc-b95d-451e-be52-7303adf9a0d3}",
      "strict_min_version": "128.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}