This is a browser extension for Chrome based browsers and Firefox to add a QR code per client ID to the page when on https://www.reddit.com/prefs/apps or https://old.reddit.com/prefs/apps. Then you can scan the QR code in a Reddit app, a `QR code scanner, Google Lens, or Google Camera.
[Reddit-app-helper] uses qr-creator as it's QR code library, and wouldn't exist without it.
Note
These are just example client IDs, and have been removed.