For those who use the browser-based version of Instagram, WhatsApp, or Facebook, Meta released earlier this year a browser extension called Code Verify that checks if the JavaScript libraries used by the services are up-to-date and have not been modified.

This is actually a very good thing. Remember that big kerfuffle a couple years ago about how ProtonMail (or any website) could serve malicious JavaScript to a single person, making it relatively easy to steal their data without being caught?

This would, in theory, prevent that.