For an exhibition purposes we developed an Google Chrome extension so that all links of an homepage can be shown as QR Codes,… so that customers could easily “copy” the link via their smart phones.

I found that Google Chrome extensions can be coded as javascript with full access to the loaded page and all you need are the scripts and a manifest file:

Here our extension: Link2QR

To use this extension you just have to open the extension settings and use “load unpacked extension” button (or in German: “Entpackte Erweriterungen laden”)
QRCode Chrome Settings

If you need more information about the Extension Scripts and manifest file I found this link:

 

Content Scripts