Is Gesturefy safe?

Adds customizable mouse gestures for running browser commands with mouse movements.

This extension lets you trigger commands by moving the mouse while holding a mouse button, using rocker gestures, or using wheel gestures. It includes more than 80 predefined commands, configurable gesture trace and status styles, themes, and support for special commands such as popup, user script, multi purpose, and cross add-on commands. It requires access to all websites so gestures can work on pages, but it does not work on restricted Firefox pages such as Mozilla pages, about:addons, or other add-on option pages.