This is a chrome unpacked extension.
To install goto:
Chrome -> Window -> Extensions click on "Load unpacked extension" and select the directory where this extension is contained
This is just a beginning. Better analysis of the selection is highly desirable.
The code in this extension is a modified version of a chrome extension that I found on the net (and a blog) article. The name of the extension was:
"name": "Linx Bookmark 1.1", "description": "Adds the current page to the Linx bookmarking system.", "version": "1.1",
Unfortunately I cannot give a more precise reference, and have not been able to find the original. Mail my if you stumble over the origonal.
Some the code in content_script.js came from http://dev.day.com/content/ddc/blog/2010/06.html