I have been very impressed by the progress of web browsers. However, they simply don't replace an operating system until they start acting like the keepers of

I have been very impressed by the progress of web browsers. However, they simply don't replace an operating system until they start acting like the keepers of an entire ecosystem of applications. Browsers are still way too careless. For example, why should a modern browser allow me to immediately close a window with a web app running (the equivalent of an OS' "shut down without warning")? Why do browsers even show a page's "reset" buttons (also known as "destroy everything with no Undo")? And the Browser Operating System can still do the equivalent of "kernel panic" by taking out 14 windows (which aren't really windows, but web applications) when it dies. The closest I've come to "nice" is OmniWeb on my Mac, where they have excellent per-site preferences. This at least gives me some control over each web application, as if the browser were an OS. It isn't enough, but it's a good start.