Firefox 151 brings a big privacy boost and fixes 30+ security flaws
Firefox 151 has been released, introducing significant privacy enhancements and fixing over 30 security vulnerabilities. The update features improved tracking protection and new functionalities such as PDF merging and expanded VPN locations. Users can now clear entire private browsing sessions with a single click, enhancing user experience and security.
- ▪Firefox 151 fixes over 30 security vulnerabilities, including four high-risk flaws.
- ▪The update introduces enhanced privacy features with 14% better tracking protection.
- ▪New functionalities include PDF merging capabilities and expanded VPN locations across several countries.
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Story provenance
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Record
| Original publisher | PCWorld |
| Canonical URL | https://www.pcworld.com/article/3144596/firefox-151-brings-a-big-privacy-boost-and-fixes-30-security-flaws.html |
| Publication time | Wed, 20 May 2026 16:29:19 +0000 |
| Retrieval time | 2026-05-20T16:35:02.753Z |
| Last seen | 2026-05-20T16:35:02.753Z |
| 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 | so3BO35S6WNg |
| 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
News Firefox 151 brings a big privacy boost and fixes 30+ security flaws Firefox 151 is out for Windows, macOS, Linux, and Android with fingerprinting protection, PDF merging, VPN locations, and security fixes. By Frank Ziemann Contributor, PCWorld May 20, 2026 9:29 am PDT Image: Mozilla Summary created by Smart Answers AIIn summary:PCWorld reports that Firefox 151 fixes over 30 security vulnerabilities, including four high-risk flaws that could allow browser sandbox escape.The update introduces enhanced privacy features with 14% better tracking protection and one-click private browsing session clearing.New functionality includes PDF merging capabilities and expanded VPN locations across US, Canada, UK, France, and Germany.
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Excerpt limited to ~120 words for fair-use compliance. The full article is at PCWorld.
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