Worked on enhancing Web Platform Tests within the mozilla/gecko-dev repository, focusing on Web Storage test validation to improve browser compatibility checks. Addressed Bug 1975405 by updating JavaScript-based tests to enforce non-configurable property deletion in accordance with the WebIDL specification. This involved modifying test assertions so that properties defined as non-configurable could not be deleted, ensuring accurate detection of spec violations during automated validation. Leveraged skills in testing and web development to align test expectations with evolving standards, thereby strengthening the reliability of storage object override coverage and enabling earlier identification of deviations in browser storage implementations during continuous integration.