To help reduce noisy JavaScript errors when using Sentry for error tracking, consider configuring Sentry to whitelist specific URLs to ignore problematic errors originating from browser extensions, malware, or 3rd-party applications. Using inbound data filters can also discard known low-value errors, such as those triggered by legacy browsers or web crawlers. Keeping the latest version of Raven.js installed and utilizing source maps can improve error grouping and reduce noise in issue streams. Ignoring troublesome errors via Sentry's UI or configuration can prevent them from reaching servers and counting against account quotas. Finally, uploading production JavaScript files and source maps as release artifacts ensures maximum grouping effectiveness by providing direct access to these files. By implementing these strategies, developers can greatly reduce the amount of noisy JavaScript errors they receive.