Rated 5 out of 5 stars

by cellar_man on May 28, 2010 · permalink

I've always found openpdf.com to be a very useful resource. It is a search engine for PDF documents (eBooks) which also has a built in PDF viewer, allowing the viewing of them directly from the site. They can also be viewed in a PDF viewer (Adobe Acrobat, Evince etc.). This Firefox add-on makes openpdf.com even more convenient to use, as it facilitates the searching for PDF document directly from the Firefox search box. If you need a PDF search engine, then I can highly recommend this Firefox add-on.