The sandbox stuff adds another layer of protection here, no reason not to use it for something so critical like online banking, especially when the functionality is free
browser related >>> sandboxing will never protect you from such online threats
... from exploits attempting to gain access to the rest of your data on your PC yes, but from cross-scripting etc...while you're providing private information on the net, the sandbox there will be as useful as an umbrella during a tsunami. Private browsing's still worse... protects from nothing except from the cops if needed
, ie would prevent from finding "sensitive" browsing data on the hdd, as it gets loaded in RAM only (history, cache, cookies...), and that's it. Your IP's still caught on the web sites you visit
, and the private data you provide is as vulnerable to online attacks as usual.