--- title: Security researcher finds 287 Chrome extensions leaking data description: A security researcher identified 287 Chrome extensions with 37.4 million installations that exfiltrate browsing history data to over 30 companies, including... canonical: https://daily.dev/posts/security-researcher-finds-287-chrome-extensions-leaking-data-qpju9q2n6 twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Security researcher finds 287 Chrome extensions leaking data | daily.dev og:description: A security researcher identified 287 Chrome extensions with 37.4 million installations that exfiltrate browsing history data to over 30 companies, including... og:url: https://daily.dev/posts/security-researcher-finds-287-chrome-extensions-leaking-data-qpju9q2n6 og:image: https://api.daily.dev/og/posts/qPju9q2n6.png og:image:alt: Security researcher finds 287 Chrome extensions leaking data og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Security researcher finds 287 Chrome extensions leaking data **[The Register](https://daily.dev/sources/theregister)** · 5 min read · 0 upvotes · 0 comments ## Summary A security researcher identified 287 Chrome extensions with 37.4 million installations that exfiltrate browsing history data to over 30 companies, including Similarweb, Semrush, Alibaba, and ByteDance. The researcher developed an automated testing system using Docker and MITM proxies to detect history leakage by correlating outbound network requests with visited URLs. While some data collection is disclosed in privacy policies, users often don't realize they've consented to having their browsing data sold to data brokers. The findings highlight ongoing privacy concerns with browser extensions despite Google's Limited Use policy. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [Spying Chrome Extensions: 287 Extensions spying on 37M users](https://daily.dev/posts/spying-chrome-extensions-287-extensions-spying-on-37m-users-zc89tp8r9) · Hacker News · 0 upvotes · 0 comments --- Tags: [#data-science](https://daily.dev/tags/data-science), [#devtools](https://daily.dev/tags/devtools), [#google-chrome](https://daily.dev/tags/google-chrome), [#privacy](https://daily.dev/tags/privacy), [#security](https://daily.dev/tags/security) [View this post on daily.dev](https://daily.dev/posts/security-researcher-finds-287-chrome-extensions-leaking-data-qpju9q2n6) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"Security researcher finds 287 Chrome extensions leaking data","url":"https://daily.dev/posts/security-researcher-finds-287-chrome-extensions-leaking-data-qpju9q2n6","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/security-researcher-finds-287-chrome-extensions-leaking-data-qpju9q2n6"},"datePublished":"2026-02-11T21:27:15.256Z","dateModified":"2026-03-15T03:29:47.159Z","description":"A security researcher identified 287 Chrome extensions with 37.4 million installations that exfiltrate browsing history data to over 30 companies, including...","image":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/bb0749309d51ff36020dd08e066936cc?_a=AQAEunF","thumbnailUrl":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/bb0749309d51ff36020dd08e066936cc?_a=AQAEunF","isAccessibleForFree":true,"articleSection":"The Register","inLanguage":"en","publisher":{"@type":"Organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180}},"author":{"@type":"Organization","name":"The Register","logo":"https://media.daily.dev/image/upload/t_logo,f_auto/v1/logos/66aa2113fdad463992ffcbf0e8963fda","url":"https://daily.dev/sources/theregister"},"commentCount":0,"discussionUrl":"https://daily.dev/posts/security-researcher-finds-287-chrome-extensions-leaking-data-qpju9q2n6","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":0},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":0}],"keywords":"data-science,devtools,google-chrome,privacy,security","timeRequired":"PT5M"} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"The Register","item":"https://daily.dev/sources/theregister"},{"@type":"ListItem","position":3,"name":"Security researcher finds 287 Chrome extensions leaking data"}]} ```