Not a problem. I will provide a couple of paragraphs which explain to a limited extent the far-reaching aspects of the JST.
The Joseph Smith Translation similarly provides missing details to the story of Joseph, who was a prophet like his father, grandfather, and great-grandfather before him. The Bible makes the point in the cases of Abraham, Isaac, and Jacob that the Lord appeared to each of these great men to reestablish the Abrahamic covenant individually. They each were shown a vision of the future of their posterity, whom they blessed and counseled accordingly (see, for example, Jacob’s prophetic patriarchal blessings to his 12 sons in Genesis 49). These patriarchal witnesses and blessings are known among biblical scholars as “testaments.”
But where is the testament of Joseph, the birthright son of Jacob and spiritual head of the family after his father’s death? It is in the Joseph Smith Translation of Genesis 50, which adds 15 verses to the story of Joseph, containing his witness of the power of the covenant to his brothers and to his descendants, along with an important prophetic look into the future. Joseph prophesied of the bondage in Egypt, the deliverance under Moses, the coming of the Messiah, the scattering of Israel, and the coming forth of a great prophet from his own lineage, for the Lord had promised: “And his name shall be called Joseph, and it shall be after the name of his father; and he shall be like unto you; for the thing which the Lord shall bring forth by his hand shall bring my people unto salvation” (JST, Gen. 50:33). While Joseph of Egypt, in the deliverance of his brethren from captivity, was a type of Jesus Christ, he is also a type of Joseph Smith, his descendant, who would open the work of salvation for the remnant of Israel.
Do you believe that these added verses are "plain and precious truths" which Christians removed from the Bible during the Great Apostasy?