The topic related to Firefox apk installation policy in the commercial device.

Hi, Mozilla team: I would like to ask for one topic related to Firefox apk installation policy in the commercial device. From my understanding, Firefox browser is the free software shared to the end users. In the business case, is any cost/contract necessary to proceed the firefox apk installed in the commercial device for the shipment? For example, the company want to build in Firefox apk in Android OS to the customer, what are the necessary steps to inform/negotiate with mozilla? Or it can simply build in apk which is downloaded from the official site without the further notice? Please let me know the contact windows and the principle to proceed. Thanks.