PDFFreeSearch is a dubious add-on for Google Chrome and Mozilla Firefox. Its description says that it is a very useful tool for discovering PDF files online. However, in reality, it does nothing to enhance your ability to search the Web. In fact, it is likely to have the opposite effect. This add-on is classified as a Potentially Unwanted Program (PUP) and it manipulates browser settings without your permission.
It promotes the websites Portal.pdffreesearch.com and Feed.pdffreesearch.com. While these are not harmful, they will not yield satisfying search results. In fact, they may often redirect you to low-quality search services that promote sponsored content and various advertisements.
If you install PDFFreeSearch and it modifies your browser settings, you should consider removing this PUP immediately. The best way to take care of the task is to use an up-to-date Windows security scanner, which will discover and eliminate all files related to PDFFreeSearch. Keep in mind that once you get rid of this app, you may need to manually reset your browser settings back to their previous values.