[goodusername]

To me, this seem like a fine initiative, all things considered.

There's a bit of a false dichotomy in some comments, where Mozilla Rally is preventing or hampering Mozilla from improving Firefox. They can and should do both at the same time, especially if both are positive things.

It doesn't mean all their initiatives are equally good, and that we shouldn't still criticize the bad ones. But this seems benign at worst, and could possibly do some good. it's completely opt in, transparent, and with very strong user control over the data.

Instead of chastising them for all their other shortcomings yet again, I prefer to be happy that this might benefit ethical research.