Форум поддержки Firefox для Android

I have been living a battery drain issue in background. When i do not force stop firefox manually, it just continues to drain some percentage of my battery while my whole usage. Like 10% to 30%. It's worse when i turn my phone off and sleep. Firefox drains all of my battery while i sleep.

I am migrating to a new phone. WhatsApp offered firefox as an option for storing its passkey. That took me to the connection and synchronisation process which the new phone said had failed. However all my tabs and other passwords appear to be syncing. Now selecting firefox to store the WhatsApp passkey takes me back to the failure page every time. Any idea how to restart the passkey addition to firefox process? WhatsApp won't work whilst I'm hung up in limbo between the two apps.