@analyticstrend/extension

Product analytics for Chromium and Firefox extensions. No remote code, so it clears Manifest V3 and Mozilla's review policy.

npm install @analyticstrend/extension

// background.js — at the top level, so it runs on every background start. Not awaited:
// Chrome will not run a service worker that uses top-level await.
import { initBackground } from "@analyticstrend/extension";

const analytics = initBackground({
  writeKey: "wk_your_key_here",
  uninstallTracking: true,
});

analytics.track("popup_opened");

Events are written to extension storage before any send, so a suspended service worker mid-flush loses nothing and never sends twice.

Firefox note. Chrome remembers an uninstall URL across restarts; Firefox forgets it when its event page unloads. Passing uninstallTracking: true re-registers on every start, which is why registering from an onInstalled handler instead works on Chrome forever and stops working on Firefox within a minute.

Full documentation: https://analyticstrend.com/docs