Depends what you mean by security.
If you mean privacy, no such thing exists. All browsers snitch on you, and trying to actually have a private life will land you in jail soon enough.
If you want to do online banking, any of the big three will do if updated regularly.
I’d choose firefox as a symbolic protest against tech oligarchy.
Meta will face daily fines of €89,500 if it doesn’t comply with the order.
Bet they can write it off as expenses.