Wow, interesting question!
Yes, it is a dial up connection.
When I use IE, something called AT&T Worldnet Accelerator runs automatically (as far as I remember, I've never requested this and am not paying anything for it; it just kinda "showed up" one day.)
When I use Foxfire, I'll get a message as I close the browser that this AT&T Accelerator was not running.
Never thought of that before; hmmm....
(BTW, thank all of you for your help, I *really* appreciate it!)