Worked on the newrelic/newrelic-browser-agent repository to enhance data submission reliability for browser agents operating in extension background contexts. Developed a fetch-based submission method, known as xhrFetch, to provide a robust fallback where XMLHttpRequest is unavailable. Refactored the submit-data pipeline to support this new approach, improving maintainability and enabling better test coverage. Focused on cross-environment compatibility, ensuring that data submission remains reliable in constrained extension environments. Utilized JavaScript, the Fetch API, and Web APIs to implement these changes. No major bugs were addressed during this period, with ongoing post-release monitoring planned to ensure continued stability and performance.