The Protestantism tag wiki says:
Protestantism is technically used to describe churches and denominations arising from the Reformation, or descended from them, but also informally as a catchall for any Western non-Catholic church. Use this tag for questions relating to general beliefs and practices of such churches.
This seems deliberately intended to include restorationist denominations like the Mormons. But the clear consensus is that Mormons aren't Protestant!
I think this tag wiki needs to be edited. Any suggestions?
Edit: Another problem is that most protestants aren't "Western" now too.