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What you guys just won't grasp is that:

1. You will absolutely obliterate any trust you have with actions like this. This is important. Because if you continue to ignore this and you will have tons of data but you will be absolutely clueless as to why your product and brand are completely abandoned.

2. This data isn't worth that much to begin with. Here is a crazy idea, try to make a better browser instead.

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This data will be used in the pursuit of #2. As it turns out, a lack of understanding of what users are doing with their browsers is an obstacle to making a better browser. Performance issues in complex systems often only show up in production, and that's what Mozilla is trying to collect this data to fix.

Why is opt-in data not sufficient? Why can't Mozilla take the top-N sites and test them out for themselves?

We're already doing that. Experience shows that this is not sufficient to accurately catch regressions.

Also, just because a site is part of the top-N doesn't mean that it's part of the top-N for Firefox users.

Can you give any examples of sites and URLs that you've missed with opt-in data?

As it turns out, people use firefox to display web pages.

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