Firefox 151 Now Available With Document Picture-in-Picture API
Firefox 151 has been released, introducing several updates to the web browser. Notable features include improvements to built-in VPN support, private browsing, and the Document Picture-in-Picture API. The update also allows for easier profile backups and restorations across macOS and Linux platforms.
- ▪Firefox 151 is the latest monthly update to Mozilla's open-source web browser.
- ▪The Document Picture-in-Picture API allows for an always-on-top window with arbitrary HTML contents.
- ▪Local profile backups are now available for easier transfer and restoration across platforms.
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Story provenance
Attribution is not the same as permission. This drawer separates discovery metadata, excerpts, WeSearch-generated summaries, reuse status, and whether the publisher receives the visit. Nothing here claims a legal grant the publisher has not made.
Record
| Original publisher | Phoronix |
| Canonical URL | https://www.phoronix.com/news/Firefox-151 |
| Publication time | Mon, 18 May 2026 08:46:34 -0400 |
| Retrieval time | 2026-05-18T12:54:56.463Z |
| Last seen | 2026-05-18T12:54:56.463Z |
| Headline source | Publisher (no WeSearch rewrite) |
| Excerpt source | publisher body |
| Excerpt method | First ~120 words (~800 chars) of extracted publisher body, fair-use limited. |
| Summary | WeSearch · cerebras-chat (WeSearch summarizer) |
| Summary source text | contentText |
| Citation coverage | Summary is a WeSearch-generated derivative; primary citation is the original publisher URL. |
| Cluster | 7FbO-BzctXPO |
| Cluster logic | Grouped by semantic title/content similarity across sources within a rolling window. Same-publisher template collisions are excluded from coverage comparison. |
| Ranking reason | Story pages are not engagement-ranked. Hub feeds use recency, with optional source-diversified chronological ordering (cap consecutive stories per source). No personalized ranking. |
| Publisher visit | Yes — open original |
| Substitutes article? | No — link-out required for full text |
Rights status (four layers)
WeSearch handling by dimension
| Indexing | May the item be indexed (stored, ranked, made findable)? | Allowed |
| Snippet | May a short excerpt of the publisher's text be shown? | Allowed |
| AI summary | May WeSearch generate its own short summary of the article? | Limited |
| Retrieval / RAG | May the content be exposed for third-party retrieval-augmented generation? | Not asserted |
| Model training | May the content be used to train AI models? | Not asserted |
| Commercial reuse | May the content be reused commercially? | Not permitted |
Basis: Derived from the published RSS/Atom feed. Contact: [email protected]. Reviewed: 2026-07-24.
Opening excerpt (first ~120 words) tap to expand
Firefox 151 Now Available With Document Picture-in-Picture API Written by Michael Larabel in Mozilla on 18 May 2026 at 08:46 AM EDT. Add A Comment Firefox 151 release binaries are now available as the latest monthly update to Mozilla's open-source web browser. While there was talk of Firefox 151 shipping a native JPEG-XL image decoder, that feature was punted to Firefox 152 beta. But there are updates to its built-in VPN support, private browsing improvements, various settings changes, support for merging multiple PDFs directly within the Firefox PDF viewer, and a number of new developer APIs. One change worth noting on the Linux (and macOS) side is that local profile back-ups are now available with support for restoring them across platforms.
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Excerpt limited to ~120 words for fair-use compliance. The full article is at Phoronix.