Both things, security and privacy, are sides of the same coin. Hacking is nothing more than remote, and unauthorized, manipulation of data in a device you don't own. If you install a keylogger without the user knowing... are we talking about security, privacy, or both?

Lockdown mode helps with keeping the processes isolated, many typical browser features can be used, and are actively used, to fingerprint users. Data, even metadata, is worth more than money these days, with several AI models being developed, and needing training.