Have you installed PDFForge-Toolbar developed by Spigot? If this is the case, you are now presented with a toolbar which activates links to pdfforge.org, eBay, Amazon, Facebook, Twitter, Google+ and other services. It has been discovered that while installing this version of the toolbar onto your browsers, you are offered to install Yahoo search tools. If you check the box indicating this installation, the home page and the search provider of your br active browser could be changed.