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.
Bluetooth lets you exchange data over a short distance. Learn how to enable it on your Firefox OS device so you can easily share files with others.
You can check to see what version of the Firefox OS software you have by looking under Device Information in the Settings app.
This article explains how to clear the browsing history, the cookies and stored data on the Firefox Browser on Firefox OS.