> I don't buy Mozilla's/Apple's concerns for those APIs. Sure if seems sketch to access USB from the web, but as a user if I'm trying to achieve something and I

> I don't buy Mozilla's/Apple's concerns for those APIs. Sure if seems sketch to access USB from the web, but as a user if I'm trying to achieve something and I can't do it on the web, I'll end up installing a native app which has way more access to my system. There's a third possibility: that you give up achieving that something. The "activation energy" of installing an app is higher than loading a website, so if the user's desire for achieving that something is not strong enough, the native app won't be installed. And besides, most users know (or should know) that installing apps can be risky, while a website is supposed to be sandboxed. That is, absent exploitable browser implementation bugs, going to any website should be safe.