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Yahoo Mail is testing a program that forces users to look at ads.

Last week, a select group of users using ad blocker software on Chrome and Firefox were blocked from accessing their accounts by a message that said, "Please disable Ad Blocker to continue using Yahoo Mail."

Over the weekend, a spokesman told Endgadget the program is experimental, saying, "Yahoo is continually developing and testing new product experiences." He added, "This is a test we're running for a small number of Yahoo Mail users in the US."

Read more on WashingtonExaminer.com