It’s not the job of the browser to secure your data against OS-level adversaries, that’s the job of the OS (e.g. by using file permissions to protect against ot

It’s not the job of the browser to secure your data against OS-level adversaries, that’s the job of the OS (e.g. by using file permissions to protect against other users and ideally also MAC to protect against other software). It’s not even the responsibility of the browser to protect against someone else walking up to your computer while you’re using the toilet, that’s the job of the screensaver. It is, however, the browser’s job to protect your passwords against other websites and the like, and I would be worried if there were bugs in that area, but your link doesn’t say anything about them (note also that using a password manager with an extension for protection against someone taking over the browser is useless, as that someone also owns the extension and hence can impersonate it towards the seperate password manager).