ThinkfreeFox

ThinkfreeFox is a Mozilla Firefox extension that allows you to view PDF, DOC, DOCX, RTF, XLS, XLSX, XLT, PPT, PPTX, POT, PPS and HWP files directly in the browser. You don't need to install any additional applications or software.

To view a file, just right-click it and select "Open with ThinkfreeFox". The file will open in a new browser window.

ThinkfreeFox is a great way to view documents without having to switch between different applications. It is also useful for displaying documents that are not in a format that your browser supports.