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• Latest browser releases:
• Chrome 136
• Chrome Android 136
• Edge 136
• Firefox 138
• Firefox for Android 138
• Safari 18.4
• Safari on iOS 18.4

New features in Firefox 138 (released on 2025-04-29)

• Error.isError()

  Limited availability

  Tags: javascript

  The Error.isError() static method checks whether a value is an Error object.

  Baseline availability blocked since April 2025 by Safari (1 months)

  Learn more

  • Chrome 134 Released on 2025-03-04
  • Chrome Android 134 Released on 2025-03-04
  • Edge 134 Released on 2025-03-06
  • Firefox 138 Released on 2025-04-29
  • Firefox for Android 138 Released on 2025-04-29
  • Safari ❌
  • Safari on iOS ❌

• JSON import attributes

  Newly available since 2025-04-29

  Tags: javascript Groups: JavaScript > JSON

  Module import … with { type: "json" } statements load JSON data. Also known as JSON module scripts.

  Learn more

  • Chrome 123 Released on 2024-03-19
  • Chrome Android 123 Released on 2024-03-19
  • Edge 123 Released on 2024-03-22
  • Firefox 138 Released on 2025-04-29
  • Firefox for Android 138 Released on 2025-04-29
  • Safari 17.2 Released on 2023-12-11
  • Safari on iOS 17.2 Released on 2023-12-11