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.”

Microsoft defended the practice of making its Edge browser the default in Windows 10, but left open the possibility of a future change. “As with all aspects of the product, we have designed Windows 10 as a service; if we learn from user experience that there are ways to make improvements, we will do so,” a company spokeswoman said in an email reply to a request for comment.

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.

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