Hi, is that on a Mac or on an iPad?

If it's a tablet, you also can connect to your Firefox Account without using the camera/QR method by selecting "Use Email Instead" and entering the user name and password. This article has both options: Sync bookmarks, logins and browsing history on Firefox for iOS.

It’s an iPad, not that that should even make a difference. The whole point of using the camera/QR is because you don’t remember your password (I’m on a trip and don’t have my list of 10,000 passwords with me). Also, it isn’t just the synching that’s the problem. I just used that as one example.

Here's my understanding:

(1) On your iPad, in Firefox: tap the menu button, tap "Sync and Save Data" or "Sign in to Sync"

Firefox for iOS should display an overlay with a "Ready to Scan" button. Does that appear?

(2) On your computer, in Firefox, go to https://accounts.firefox.com/pair/ and click Get Started

The page then should display a QR code. Working so far?

(3) Point your iPad at your computer screen and tap "Ready to Scan" to read the code.

(4) The iPad should display a "Confirm pairing" panel. Tap the Confirm Pairing button.

The following might only appear if you have two-factor authentication enabled:

(5) The iPad will show "Approval now required from your other device"

(6) On the computer, enter your one-time pin and then confirm the connection

Where is that breaking down for you?