Anthropic’s Claude Desktop application has come under scrutiny after users discovered it silently installs browser extension files on systems, even for web browsers that aren’t present on the user’s computer. The behaviour, which occurs without explicit user consent or notification, has sparked significant privacy and security concerns among the cybersecurity community. Users have reported finding extension files for multiple browsers including Chrome, Firefox, Edge, and others deposited on their systems following Claude Desktop installation, regardless of which browsers they actually use.
The silent installation raises questions about data collection practices and user autonomy, as browser extensions typically have extensive permissions to access browsing data, modify web pages, and monitor user activity. Security researchers have expressed alarm that the practice bypasses standard browser security protocols that normally require user approval before extensions can be installed. Critics argue this approach contradicts modern privacy principles and informed consent standards that have become industry expectations.