Posted by Nick Boyce on Feb 09
I'll bite ... (I know your question was rhetorical)It's a very bad idea IMO.
(https://wiki.mozilla.org/MetricsDataPing)
"Mozilla has a critical need to be able to understand
the factors that cause installations of Firefox to no
longer be used. The system must have some way to
detect an abandoned installation."
Their proposed solution seems to be (from the bug and wiki) to include
code in Firefox to submit a lot...