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>Add-on was also closed source.

What made you think it was closed source? The source for the add-on: https://github.com/mozilla/addon-wr

Not very different from Pocket nor Hello?

Neither of which should have been included in the core browser (even though I quite liked hello, and have been using appear.in, it's more stable cousin, for years now)

It's almost worse they didn't make any money for it. Shows what price they put on your privacy and autonomy.

"Even when turned on no user data was collected or shared."

How can that possibly be a downside? If they had made money, people would be even more up in arms. If anything, this reinforces the “Easter egg” intent of the extension; it serves no other purpose.