Re: Vervette Fluid Sandbox...
Good part, you can download them all... Hurray! And I can really recommend Chrome. Though, one has to watch out for weird extensions, as you have taught me already, hehe!
Lemi is perfectly right, it's all about GL. The worries may be more regarding browsers in general and the part that can't be handled by the GL. But even there, browsers are really fast these days. Essentially they are "runtime environments" with a Window, if you will. And violently cross-platform at that. What once was Java, now it's browsers in some way.
So, yeah, the biggest problem are the inherit restrictions a browser has regarding the computer its running on. You can't work with the clients computer outside the browser. That means, if you wish to save a file, you have to "download it", which is sort of a silly word. Reminds me of when people are in bed and say: "I go to sleep now". Used to puzzle me, haha! "You're not planning on sleeping where you are right now?" ....
Anyway, so there's that, there can't be a file manager of anything on your computer inside a website, except for loading.
Other than that, hmmm... counting advantages will get exhausting! There are many, many, many! The biggest I haven't even scratched, yet, and they will make Vervette a unique experience.