Thanks for contacting Mozilla Support. It is my pleasure to help you in importing your contacts. You can import your contacts easily from your Sim Card, SD Card, Gmail and Outlook.
For doing so, please follow the instructions below:
Import from Sim Card or Memory Card
Import from Gmail or Outlook
For more information on importing contacts, please see Add, manage and share contacts.
We hope you can import your contacts by following these steps. Please get back to us if you still have problems.