Well, I'm just saying. It's not like I - or any webmaster - can control what kind of browser members choose to use (without imposing incredible restrictions that would be unattractive in every way).
With that said, I think a simple addition like that would be more user-friendly.
An example of a browser that does not support iframes would be a mobile browser. I know it doesn't make much sense to use FlashChat on a mobile device, but I know that won't stop anyone from trying.
As for those browsers (IE included I believe) with internal options to restrict iframes, a user or firewall may set it to not allow iframes for security purposes. If this is the case (or any other case where iframes are not enabled), the users will just see nothing - no explanation, no alternative. If it happened to me, I would know where to go to still use FlashChat, but with plenty of new members each day, I doubt even 10% of them would know where FlashChat is installed by default.
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