According to the Sages, this was a prophetic reference to the End of Days, when Jacob's descendants will come to Mount Seir, the home of Edom, to deliver judgment against Esau's descendants for persecuting them throughout the millennia (see ). Source: Internet
Obadiah said that the high elevation of their dwelling place in the mountains of Seir had gone to their head, and they had puffed themselves up in pride. Source: Internet
The Horites formerly of Mount Seir were implied to be Canaanite (Hivite), although unusually there is no direct confirmation of this in the narrative. Source: Internet