This has upsides too, I'm fairly confident Mozilla wouldn't be able to comply with a secret court order.
https://brendaneich.com/2014/01/trust-but-verify/
Our plan then (while we were still at Mozilla), and my advice now, is to avoid blind trust. Use systems where you can both trust and verify that your data is not being secretly surveilled.
This has upsides too, I'm fairly confident Mozilla wouldn't be able to comply with a secret court order.