Originally Posted by Old Pedant
But that's all kind of moot: The real limit will almost surely depend on how much space the operating system has allocated for the current browser. After all, the browser has to share memory space with all the other programs executing in your computer.
V8 has a 1gb/instance default pool size, no matter how much RAM the device has. you can use command-line switches to alter that, but you shouldn't be needing that much ram, considering the async storage options available these days.