The Book of Esther is accepted by all Christian traditions, but with significant differences in content. Protestant Bibles follow the Hebrew Masoretic text (10 chapters). Catholic Bibles include six additions (chapters 11-16), known as 'The Rest of Esther,' based on the Greek Septuagint version. This 16-chapter enumeration comes from Jerome's Latin Vulgate translation, where he first translated the Hebrew text (chapters 1-10) and then added the Greek fragments as an appendix (chapters 11-16). The Ethiopian canon follows the Septuagint tradition, thus includes the additions in the same manner as the Catholic tradition.
Esther
Chapter 10 — The Greatness of Mordecai
And the king Ahasuerus laid a tribute upon the land, and upon the isles of the sea.
And all the acts of his power and of his might, and the declaration of the greatness of Mordecai, whereunto the king advanced him, are they not written in the book of the chronicles of the kings of Media and Persia?
For Mordecai the Jew was next unto king Ahasuerus, and great among the Jews, and accepted of the multitude of his brethren, seeking the wealth of his people, and speaking peace to all his seed.