Unlike on macOS Sequoia and earlier versions, the first macOS Tahoe beta does not include a FireWire section in the System Settings app.

Of course, this could all end up being a false alarm. It is still early in the macOS Tahoe beta testing cycle, and FireWire support could return in a later beta version, or in time for the final release. We reached out to Apple for comment about the matter shortly before publishing this story, and we will update this story if we hear back.

macOS Tahoe Beta Drops FireWire Support - MacRumors

Apple might be pulling Firewire's plug in Tahoe.