Examine source code of Grabline Connect

{
  "manifest_version": 3,
  "name": "Grabline Connect",
  "version": "1.20.9",
  "description": "The browser companion for Grabline, the free download manager: right-click download, hover buttons with a quality picker, grab all links or images on a page, and a per-tab list of sniffed streams. All downloading happens in the desktop app.",
  "browser_specific_settings": {
    "gecko": {
      "id": "grabline@grabline.dev",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "action": {
    "default_popup": "popup/popup.html",
    "default_icon": {
      "16": "icons/icon16.png",
      "32": "icons/icon32.png"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "contextMenus",
    "nativeMessaging",
    "storage",
    "webRequest",
    "downloads",
    "cookies",
    "tabs"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content/overlay.js"
      ],
      "run_at": "document_idle"
    },
    {
      "matches": [
        "*://*.youtube.com/*"
      ],
      "js": [
        "content/sites/button.js",
        "content/sites/youtube.js"
      ],
      "run_at": "document_idle"
    },
    {
      "matches": [
        "*://*.vimeo.com/*"
      ],
      "js": [
        "content/sites/button.js",
        "content/sites/vimeo.js"
      ],
      "run_at": "document_idle"
    },
    {
      "matches": [
        "*://*.x.com/*",
        "*://*.twitter.com/*"
      ],
      "js": [
        "content/sites/button.js",
        "content/sites/x.js"
      ],
      "run_at": "document_idle"
    },
    {
      "matches": [
        "*://*.soundcloud.com/*"
      ],
      "js": [
        "content/sites/button.js",
        "content/sites/soundcloud.js"
      ],
      "run_at": "document_idle"
    },
    {
      "matches": [
        "*://*.instagram.com/*"
      ],
      "js": [
        "content/sites/button.js",
        "content/sites/instagram.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "icons/icon48.png"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ]
}