Worked on the epam/ketcher repository to address a Firefox-specific clipboard issue affecting static elements, focusing on browser compatibility and front end development. The solution involved switching clipboard data serialization to the KET format for text/plain and stringifying objects to prevent [object Object] entries in logs, using JavaScript and TypeScript. This targeted fix restored reliable Copy, Cut, and Paste functionality for static elements in Firefox, directly resolving a regression tracked as issue #6121. The approach also improved log clarity and stability, making debugging and support more efficient. All changes were delivered with commit-based traceability to ensure transparency and maintainability.