The ethical beliefs of Protestants are the same as all Christians. They follow the teachings of Jesus in the four Gospels of the New Testament as expounded in the Epistles. They also consider the Old Testament, particularly the Ten Commandments, as a guiding light. More specifically, Protestants follow Jesus's teachings that Christians should love one another. They are to aid one another in time of trouble, give to one another in time of need, and most importantly, understand, support and comfort one another in times of trouble. Jesus emphasized the point that all humans are imperfect, and may not live up to their own standards, much less those of others. To that end, he encouraged understanding and patience, and condemned intolerance and self-righteousness.
The Ten Commandments form the basis for all Protestant ethics over and above the teachings of Jesus. Thus they are taught that it is wrong to still, kill, committ adultery, covet, or bear false witness.
In this regard, Protestants have no difference of opinion with all other Christians. They may disagree on some theological matters, but the underlying ethics are the same.