Maybe, but Mozilla has a quite a record for using firefox for surveillance and spying purpose, the early versions of firefox had a proprietary modules just for this purpose and the recent version have 'telemetry'.
AFAIK f-droid always had a warning about firefox containing and promoting non free in addition of tracking users
AFAIK f-droid always had a warning about firefox containing and promoting non free in addition of tracking users
from https://f-droid.org/wiki/page/org.mozilla.firefox :
This app has the NonFreeAdd Antifeature. This app has the Tracking Antifeature. This app has the UpstreamNonFree Antifeature.