The "Find My Device" feature lets you locate, lock or erase your information from a lost or stolen Firefox OS device via the Web.
WhatsApp isn't directly available on Firefox OS, but you can still use a WhatsApp client on your device or chat with friends using Facebook or LINE.
Firefox OS has a feature that lets you tell websites not to track your browsing behavior. Learn what tracking is, how the feature works and how to turn it on.
This article explains how to clear the browsing history, the cookies and stored data on the Firefox Browser on Firefox OS.