Is MPen safe?

Draw and annotate pages with translucent pen, shape, text, eraser, undo, and redo tools.

This extension provides on-page drawing tools including pen, line, rectangle, ellipse, text, eraser, hand, and pointer modes. It supports translucent highlighting, up to 8 undo levels, redo, keyboard shortcuts, and English and Japanese UI. It can also show error messages in browser notifications.