By Juby Babu (Reuters) -E-commerce firm eBay forecast profit for the crucial holiday quarter below Wall Street estimates amid ongoing macroeconomic uncertainty, sending its shares down 8.5% after the bell on Wednesday. Tariffs and changes to certain customs requirements in the U.S. have created significant uncertainty for small businesses, while concerns over escalating prices for imported goods have weighed on consumer confidence. EBay has continued to see macroeconomic challenges across international ...