When they say "don't support it anymore", does that mean they're back to the IE era of using Chrome specific technologies so it doesn't work in any browser, do they use user-agent sniffing and show a big popup, or is it just that they're not testing it in FF anymore? The latter shouldn't be an issue as long as they use standards, the only thing they would run into in this day and age is browser specific bugs - but Safari seems to have that the most.