A Bitcoin Price Tracker browser extension with 50,000 users according to Google's Chrome Web Store is being offered for sale at $55,650. The listing, published on September 29, includes the published product, its source code, and 14 days of handover assistance from the current owner.
The extension, provided by Extpose, displays BTC/USD pricing from Binance in the browser toolbar. The seller reports 37,100 installs over a 12-month period from September 14, 2025, through September 13, 2026. The advertisement describes the product as pre-revenue and suggests opportunities for the buyer to develop financial-information services or relevant partner offers.
The sale highlights a broader market for browser extensions. Two other extensions are also being offered: Page Auto Refresh for $24,999 and Translate for $9,999, each with their own user bases and included assets.
Ownership Transfers and Visibility
When browser extension ownership transfers, the new owner gains control over listings and future updates. However, public-facing information may not change immediately. Microsoft's documentation indicates that changes to descriptions, screenshots, privacy policies, owner names, and website links do not automatically update when ownership transfers. The previous owner's information can remain visible until the new owner publishes an extension update, creating a distinction between who controls the product and what appears publicly.
Security Concerns in Extension Acquisitions
Security firm Socket documented in August that attackers acquired five functional extensions from legitimate authors and introduced malicious updates. Socket's investigation identified 19 malicious extensions total, with five acquired from original developers. The acquired products initially performed their advertised functions but later versions introduced malicious behavior.
Socket described attacks involving wallet-connection and swap hijacking, fake hardware wallet recovery interfaces designed to collect seed phrases, and account harvesting. The largest acquired right-click utility had approximately 70,000 Chrome users and 10,000 Edge users, representing a potential exposure of 80,000 users.
In a February case documented by Annex, an image-search extension called QuickLens changed ownership on February 1, followed by a malicious version 5.8 released just 16 days later. The update added permissions that triggered acceptance prompts while maintaining the original functionality.
User Considerations
The current Bitcoin Price Tracker sale advertisement does not document a completed transaction or connect the product to malware. However, the cases documented by security researchers show why an extension's continued usefulness does not guarantee the safety of its other behavior after ownership changes.
Google's program policies prohibit malware and phishing and restrict collected information to the extension's disclosed purpose. Transfer of information as part of an acquisition requires explicit prior consent. Socket recommends that users regularly review their installed extensions and remove any that are unnecessary or suspicious.
