Now open your browser and click on Options. All you have to do is download Foxit Reader from the link below and install it. I have been using it for almost 4 years without any problems. One of the best things about Foxit Reader is that it’s FREE and extremely light. So you have two options either download these small files to your system or download Foxit Reader and view them online in your browser. If you have Adobe Acrobat reader plugin for Firefox then its good, but if you have the new version of Firefox then you must have encountered some problems while viewing the pdf file in your browser. Sometimes we end up finding some document in pdf format which we do not want to download to our system, so we tend to read PDF in Firefox Web Browser. There are majority of software which lets you view PDF files on your computer. PDF (Portable Document Format) is one of the most used file format to view document files. 5 Open and Read PDF Documents In Firefox Web Browser without Downloading