use counter

use counter

[1] 968923 – Implement some equivalent of Chrome's use counters (on top of telemetry?) ( 版) <https://bugzilla.mozilla.org/show_bug.cgi?id=968923>

[2] Firefox Telemetry

[3] Telemetry - MozillaWiki () <https://wiki.mozilla.org/Telemetry>

[4] Telemetry Dashboards () <https://telemetry.mozilla.org/>