Guidance on usage

[Symmetry4242]

Hello. I just added the qrcode reader to chrome but I'd like to get some instructions on how to use it. I admit I've never used one before. Should the buttons at top of the reader be active (nothing happens when I click on them)?

[beizhedenglong]

Click the extension icon will read qrcode from screen. But it can't read some qrcodes. It will be better to display some feedback message