Chrome and Firefox extensions with up to 4M installs leaked sensitive data, including names and passwords, to marketing intelligence service Nacho Analytics (Geoffrey A. Fowler/Washington Post)

Geoffrey A. Fowler / Washington Post:
Chrome and Firefox extensions with up to 4M installs leaked sensitive data, including names and passwords, to marketing intelligence service Nacho Analytics  —  As many as 4 million people have Web browser extensions that sell their every click.  And that's just the tip of the iceberg.