Examine source code of Video Saver Helper

{
  "manifest_version": 3,
  "default_locale": "en",
  "name": "__MSG_extensionName__",
  "short_name": "__MSG_extensionShortName__",
  "description": "__MSG_extensionDescription__",
  "version": "1.0.3.10",
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "video-saver-helper@daice-labo.com",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "authenticationInfo",
          "financialAndPaymentInfo",
          "personallyIdentifyingInfo",
          "websiteContent"
        ]
      }
    }
  },
  "permissions": [
    "downloads",
    "storage",
    "tabs",
    "activeTab",
    "scripting",
    "webRequest",
    "webRequestBlocking",
    "identity",
    "nativeMessaging",
    "contextMenus"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "background": {
    "page": "background/firefox-background.html"
  },
  "action": {
    "default_title": "__MSG_actionDefaultTitle__",
    "default_icon": {
      "16": "icons/icon16.png",
      "32": "icons/icon32.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    },
    "default_popup": "ui/popup.html"
  },
  "options_ui": {
    "page": "ui/bridge.html",
    "open_in_tab": true
  },
  "content_scripts": [
    {
      "matches": [
        "https://daice-labo.com/VideoSaverHelper/*"
      ],
      "js": [
        "content/vsh-checkout-return.js"
      ],
      "run_at": "document_idle"
    },
    {
      "matches": [
        "<all_urls>"
      ],
      "exclude_matches": [
        "https://www.nicovideo.jp/*",
        "https://nicovideo.jp/*",
        "https://*.nicovideo.jp/*"
      ],
      "js": [
        "content/discovery-scout.js",
        "content/observation-probe.js",
        "content/realtime-probe.js"
      ],
      "run_at": "document_idle",
      "all_frames": true
    },
    {
      "matches": [
        "<all_urls>"
      ],
      "exclude_matches": [
        "https://www.nicovideo.jp/*",
        "https://nicovideo.jp/*",
        "https://*.nicovideo.jp/*"
      ],
      "js": [
        "content/ui-live-injector.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "ui/*",
        "content/page-network-hook.js"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "version_name": "1.0.3 build 10 Firefox"
}