=='''Immigration'''==
'''Any''' questions on immigration should be sent to immigration@mozilla.com.
If you are from a country that requires a business visa to enter the US, please plan for it early as government processing time constantly change.
=====Pocket Letter=====
A pocket letter is not required to enter the US - as long as you have a proper visa, ESTA or qualify for the VWP. You can use your hotel confirmation email. If you feel you need a customs letterfor border crossing, you can request one in online registrationor immigration@mozilla.com.
=====ESTA Point of Contact=====