That's a Apple support issue or Google smart phone support to address that.

Mozilla doesn't have a way to remove Firefox from a device. To remotely wipe your device using a "Find my" service: * https://support.apple.com/guide/icloud/erase-a-device-mmfc0ef36f/icloud * https://support.google.com/accounts/answer/6160491?hl=en Meanwhile, your saved passwords are potentially at risk, so I suggest: (1) Change your Mozilla account password (2) Update passwords for critical accounts saved in your Firefox password manager