[modeless]

Ideally, I should be able to download an untrusted binary application from the internet, run it on my local machine, and be able to trust that it won't be able to steal my passwords, read my contacts and pictures and documents, use my camera and microphone, drain my battery, use up all my CPU and RAM and network and disk resources, freeze my system, or do any other nefarious thing without my permission. OSes have failed so misererably at this that web browsers have had to pick up the slack and the web is slowly morphing into a bad operating system.