Can an eMac boot from a USB optical drive connected via a FireWire adapter?

I've got an eMac that's mostly working (running Tiger, plus a selection of other nice software), but has a broken optical drive. I have a spare USB optical drive lying around, and it works for most purposes, but, according to [this discussion](https://arstechnica.com/civis/viewtopic.php?f=19&t=1182251) on the Ars Technica OpenForum, most PowerPC Macs (including eMacs) can't boot from USB drives (at least not out of the box and without a LOT of tinkering and swearing), although they _can_ boot from FireWire drives. Just in case I ever have to reinstall Mac OS X on the eMac, here's my question: if I plug a USB-to-FireWire adapter into one of the eMac's FireWire ports, and plug the USB optical drive into that, will the eMac be able to boot from said optical drive, or will I have to shell out for a FireWire optical drive?