https://developer.fullstory.com/browser/changelog/ fs.js Changelog 2026-06-03T00:00:00.000Z https://github.com/jpmonette/feed Release notes for fs.js, the Fullstory browser capture script. https://developer.fullstory.com/img/favicon.svg Copyright © 2026 Fullstory, Inc. <![CDATA[June 3, 2026]]> https://developer.fullstory.com/browser/changelog/2026-06-03/ 2026-06-03T00:00:00.000Z Client-side guardrails for the Session UID feature.

Improvements​

  • Added client-side guardrails that improve the stability and reliability of the Session UID feature.
]]> <![CDATA[June 1, 2026]]> https://developer.fullstory.com/browser/changelog/2026-06-01/ 2026-06-01T00:00:00.000Z Improved handling of misconfigured observers, plus a cleanup fix in the bundled script.

Improvements​

  • Improved observer configuration handling so that misconfigurations are gracefully rejected instead of throwing hard exceptions.

Bug fixes​

  • Removed a duplicate license comment that appeared in the bundled fs.js output.
]]> <![CDATA[April 22, 2026]]> https://developer.fullstory.com/browser/changelog/2026-04-22/ 2026-04-22T00:00:00.000Z Better Session UID lifecycle handling and network throttling for realtime recording.

Improvements​

  • Introduced throttling for realtime recording network requests to reduce load on backend services.

Bug fixes​

  • Improved session lifecycle controls for Session UIDs and fixed an issue with userId preservation during non-stateless startup.
]]> <![CDATA[March 25, 2026]]> https://developer.fullstory.com/browser/changelog/2026-03-25/ 2026-03-25T00:00:00.000Z More reliable capture of dynamically modified stylesheets.

Bug fixes​

  • Improved the reliability of capturing adoptedStyleSheets when a stylesheet is modified without explicitly reassigning it.
]]> <![CDATA[March 11, 2026]]> https://developer.fullstory.com/browser/changelog/2026-03-11/ 2026-03-11T00:00:00.000Z Viewport enter/exit tracking and expanded stylesheet capture.

New features​

  • Added support for capturing document-level mouseenter/mouseleave events to more accurately detect when a visitor's cursor enters or exits the browser viewport.
  • Expanded CSS capture to record adoptedStyleSheets.splice() calls, so stylesheets modified this way are faithfully replayed.
]]> <![CDATA[March 10, 2026]]> https://developer.fullstory.com/browser/changelog/2026-03-10/ 2026-03-10T00:00:00.000Z Faster initial load, a privacy scrubbing fix, and more accurate INP measurement.

Improvements​

  • Reduced initial load overhead by delaying creation of internal capture data structures until they're needed.

Bug fixes​

  • Fixed an issue in the console log scrubber's pattern matching that could cause some sensitive console output to not be masked.
  • Refined Interaction to Next Paint (INP) analytics to properly ignore interactions on elements excluded from capture.
]]> <![CDATA[March 2, 2026]]> https://developer.fullstory.com/browser/changelog/2026-03-02/ 2026-03-02T00:00:00.000Z Native Session UID configuration and expanded stylesheet capture.

New features​

  • Added native support for the Session UID API via the FS('init') configuration.
  • Added capture hooks for adoptedStyleSheets.push(), so dynamically added stylesheets are captured for replay.
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