Try one of these articles:
Avoid and report Mozilla tech support scams
Mozilla does not charge for software, upgrades or technical support. Find out about common scams and how to protect yourself from them.
Facebook import error on ZTE Open
Users of the ZTE Open smartphone (sold on Ebay) aren't able to import contacts from Facebook. This is a known issue that is being worked on.
Fix Gmail password errors
Learn how to fix the login error messages that appear when you try to access your Gmail account on your Firefox OS phone.
Switch to a secure email provider
There are multiple, free email providers that offer secure, encrypted connections. Using one will better protect your emails and your email password.