Can confirm this for Arc, Brave, Edge, Chromium, and Vivaldi on my machine:
#Anthropic secretly installs spyware when you install Claude Desktop
https://www.thatprivacyguy.com/blog/anthropic-spyware/

Anthropic secretly installs spyware when you install Claude Desktop — That Privacy Guy!
Anthropic's Claude Desktop silently installs a Native Messaging bridge into seven Chromium browsers, including browsers Anthropic's own documentation says it does not support, and browsers the user has not even installed.





