Mozilla yesterday went public with its complaint about Windows 10 resetting the default browser, calling it “disturbing” and demanding that it “undo its aggressive move to override user choice.”

In a letter from Mozilla CEO Chris Beard to Microsoft chief executive Satya Nadella, Beard slammed the way Windows 10 setup changed the default browser on a Windows 7 or 8.1 PC upgraded to Windows 10.

“I am writing to you about a very disturbing aspect of Windows 10,” Beard said in the letter, which Mozilla posted publicly. “Specifically, that the update experience appears to have been designed to throw away the choice your customers have made about the Internet experience they want, and replace it with the Internet experience Microsoft wants them to have.”

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