# Snowplow JavaScript trackers v4.6.6 released
> We’re happy to announce a new release for the JavaScript, Browser, and React Native trackers.
> Source: https://docs.snowplow.io/release-notes/snowplow-javascript-trackers-v4-6-6-released/
> Documentation index: https://docs.snowplow.io/llms.txt
> Date: 2025-08-26
> Components: Trackers

We’re happy to announce a [new release](https://github.com/snowplow/snowplow-javascript-tracker/releases/tag/4.6.6) for the JavaScript, Browser, and React Native trackers.

This is a small patch release addressing reported cases of invalid events, data consistency, and an issue with using the [HTML5 Media Tracking plugin](/docs/sources/web-trackers/tracking-events/media/html5/) from our Google Tag Manager Tag Template.

**Bug fixes**

- **Browser/JavaScript trackers**

  - Round the `browser_context.hardwareConcurrency` property, so it is always an integer to match the schema and avoid some invalid events
  - Do not produce a value for dimensions (screen, viewport, document) when a value is non-numeric, which may cause invalid events

- **React Native tracker**

  - Make the values automatically collected in the `mobile_context` more consistent with the values in the v2 tracker

- **Plugins**

  - `browser-plugin-media-tracking`: Allow selecting media elements via CSS selectors rather than just IDs
  - `browser-plugin-media-tracking`: Prevent a case where the media entity may not populate `currentSrc` even when it has a `src`
  - `browser-plugin-media-tracking`: Update README to match current API

- **General**

  - Fix the [API reference documentation](https://snowplow.github.io/snowplow-javascript-tracker/) to correctly generate and update for all SDKs