> You should be able to count this with BROWSER_SET_DEFAULT_ERROR on Win 8+.
Clarification: This histogram counts success as well as error, so you can look at the 0 bucket. This only counts in response to accepting the default browser prompt (modal or notification bar), other methods of setting the default (command line, button in about:preferences, etc) doesn't get recorded.
Bug 1641713 Comment 6 Edit History
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> You should be able to count this with BROWSER_SET_DEFAULT_ERROR on Win 8+.
Clarification: This histogram counts success as well as error, so you can look at the 0 bucket. This only counts in response to accepting the default browser prompt (modal or notification bar), other methods of setting the default (command line, button in about:preferences, etc) don't get recorded.