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Zen browser had a backdoor enabled by default
(github.com)
This is a most excellent place for technology news and articles.
According to https://github.com/zen-browser/desktop/issues/5947#issuecomment-2737211334 one of the issues is that Mozilla's telemetry remains enabled which (if happening in secret) is bad and also dumb because Mozilla can't even use telemetry of a very different browser.