I had create Firefox add-on. It flips image on web pages to help Archos Gen8 recognize QR codes. As default Archos grabs mirrored image by front-face camera.
Download Firefox add-on here: https://addons.mozilla.org/ru/firefox/addon/261479/
Update: In 3-7 days my add-on will be reviewed and it will have public page on addons.mozilla.
In to-do: add options to scale small QR codes. For example. If QR code on page 100x100px. It will be difficult to make good shot of it. It may resize it to 400x400 px or 300x300px. Is it good idea?
This extension works only one time on the image. If you need to revert image to normal view - simple refresh (F5) the page.
Known bugs: In Firefox 4.0beta There is a problem with image quality. I try to find solution. So small QR codes will be difficult to scan (100x100px or smaller)
Example of flipped images in attachment.