[header] How to manage file type associations in firefox [title] Look closely at the e-mail attachment and try to find what kind of file it is. [step] If they are one of those files pps, ppsx, or ppsm they require the association. [substeps] Install a free program powerpoint viewer from this official microsoft page if you don't have it on your computer yet. 
[title] Open control panel and find a search window on the right hand corner. [title] To go directly to the option type " file association " in the search window as shown on image.