Is 3MF to U1 - Universal Snapmaker Converter safe?

Converts .3mf files to Snapmaker U1 format directly in the browser.

This extension can intercept downloaded .3mf files or let you manually drop in a local .3mf file for conversion. It provides filament mapping controls, color selection, slot reordering, Tree Support detection, and saves converted files with the original name plus “-U1.3mf”. The store description states that processing runs locally in the browser with no account or server involved.