Examine source code of Download with FlashGet

{
  "manifest_version": 3,
  "name": "Download with FlashGet™",
  "description": "Optionally send your downloading jobs to the well-known FlashGet™ download manager",
  "version": "0.2.3",
  "permissions": [
    "storage",
    "nativeMessaging",
    "notifications",
    "downloads",
    "contextMenus",
    "scripting"
  ],
  "optional_host_permissions": [
    "*://*/*"
  ],
  "background": {
    "service_worker": "worker.js",
    "scripts": [
      "config.js",
      "termlib_parser.js",
      "context.js",
      "worker.js"
    ]
  },
  "action": {},
  "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"
  },
  "homepage_url": "https://webextension.org/listing/download-with.html?from=flashget",
  "options_ui": {
    "open_in_tab": true,
    "page": "data/options/index.html"
  },
  "web_accessible_resources": [
    {
      "resources": [
        "data/grab/index.html"
      ],
      "matches": [
        "*://*/*"
      ]
    }
  ],
  "commands": {
    "_execute_action": {}
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{48f5395d-5c00-41cd-9a5e-fd2f8d9b74c2}",
      "strict_min_version": "128.0"
    }
  }
}