Hotmail and Outlook are set to sync emails from a certain time period. To see all of your email, you'll need to change the account setting to sync all messages.
This article explains how to clear the browsing history, the cookies and stored data on the Firefox Browser on Firefox OS.
You can check to see what version of the Firefox OS software you have by looking under Device Information in the Settings app.
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.