# Puppeteer puppeteer-core-v25.9.0 — puppeteer-core: v25.9.0

- Product: Puppeteer (https://whatsnew.fyi/product/puppeteer)
- Vendor: Chrome DevTools
- Date: 2026-08-25
- Version: puppeteer-core-v25.9.0
- Original notes: https://github.com/puppeteer/puppeteer/releases/tag/puppeteer-core-v25.9.0
- Permalink: https://whatsnew.fyi/product/puppeteer/releases/puppeteer-core-v25.9.0

What's New is an index, not a publisher: every entry below links to the vendor's own release notes, which are the authoritative source. Entries are labelled where they are hand-curated sample data, pre-releases, or drawn from a secondary source such as a developer blog.

Reuse: the summaries, labels and curation here are © What's New. Quote freely with attribution and a link back; wholesale republication of the corpus is not permitted — terms: https://whatsnew.fyi/terms. The vendors' own release notes remain their publishers'.

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- **changed** — Roll to Firefox 154.0
- **added** — Support shadow roots in MutationPoller
- **added** — Support canceling tool execution in webmcp
- **fixed** — Roll to Chrome 152.0.7977.54
- **fixed** — Set frame content without document.write

##### [25.9.0](https://github.com/puppeteer/puppeteer/compare/puppeteer-core-v25.8.0...puppeteer-core-v25.9.0) (2026-08-24)


###### 🎉 Features

* roll to Firefox 154.0 ([#15361](https://github.com/puppeteer/puppeteer/issues/15361)) ([d702da7](https://github.com/puppeteer/puppeteer/commit/d702da7ec7d72e3a814ffcf0c4bc70a11c171748))
* support shadow roots in MutationPoller ([#15292](https://github.com/puppeteer/puppeteer/issues/15292)) ([4670a25](https://github.com/puppeteer/puppeteer/commit/4670a25b16d48c8be8e4a747412a8caf4509063f))
* **webmcp:** support canceling tool execution ([#15365](https://github.com/puppeteer/puppeteer/issues/15365)) ([3523f36](https://github.com/puppeteer/puppeteer/commit/3523f36e840b6c7ebf1167eddb5c2e83c9262c68))


###### 🛠️ Fixes

* roll to Chrome 152.0.7977.54 ([#15363](https://github.com/puppeteer/puppeteer/issues/15363)) ([9088feb](https://github.com/puppeteer/puppeteer/commit/9088feb7d71cda035eee4f4d21cb20fee9238aa9))
* set frame content without document.write ([#15358](https://github.com/puppeteer/puppeteer/issues/15358)) ([83f8d1c](https://github.com/puppeteer/puppeteer/commit/83f8d1c8536f238dbdfdf041c72581bdf2b6f3de))