Unless you're one of the users running into those mysterious "memory leaks" that nobody can replicate once they file an actual bug
I stopped using Firefox a couple of years ago because of this. They're not mysterious, they were real. Try opening a reasonable amount of tabs (50-100), and leave the browser open for a day or two, and you'll probably be able to reproduce it.
The value of a thing is nothing more than more the price which people are willing to pay to acquire it.
So, why would you choose an unstable, national currency over a more stable, international one? As many african countries can attest, having your own currency is only effective if your economy is stable.