The current usage of Telemetry for use-counters is not ideal and wasteful. I'm filing this bug to keep track of this and looking into alternatives. We use lots of boolean histograms to count feature usage, two histograms counting usage per "page" and "document". Each histogram then counts both "used" and "unused". Ideally we can do a more optimized implementation e.g.: - just collect one set of counters (e.g. only for usage per "page") - have one global "page" counter - for each feature, use one scalar that counts whether it was "used" in a page load https://firefox-source-docs.mozilla.org/toolkit/components/telemetry/telemetry/collection/use-counters.html