[1] 968923 – Implement some equivalent of Chrome's use counters (on top of telemetry?) (6/12/2015, 1:26:51 PM 版) <https://bugzilla.mozilla.org/show_bug.cgi?id=968923>
[2] Firefox Telemetry
[3] Telemetry - MozillaWiki (7/12/2017, 4:47:49 AM) <https://wiki.mozilla.org/Telemetry>
[4] Telemetry Dashboards (7/10/2017, 4:05:12 PM) <https://telemetry.mozilla.org/>
Google search: use counter