This app is now totally useless with the latest Firefox 57. Do not waste your time installing it.
I have no idea why it post processes for an extraordinary length of time resulting with a QR stamp and asking to sign up for a license.
How can it take so long with the latest quad core i7 gaming computer?
I have now removed it. There are plenty of alternatives that work correctly.
It is a great shame because it used to be one of the best, which I had reviewed with 5 stars in the past.