Is Online protractor safe?

Measures angles on screen with a movable, resizable, and rotatable virtual protractor.

This extension opens a virtual protractor for measuring angles by placing its midpoint on a vertex and aligning two pins with the angle sides. It supports moving the protractor with the mouse or arrow keys, resizing it, rotating it, and choosing clockwise or counterclockwise rotation in options. The description says it can also measure angles on JPG and PDF files when file URL access is allowed.