(If you use an add-on and need help with it, you should visit the add-on site or contact the add-on developer for support.) You can contact the website in such cases, or you can try a Firefox add-on such as Content-Type Fixer to work around the problem. To learn more, see Properly configuring server MIME types and Common MIME types at MDN web docs. For example, Firefox may display the content as plain text instead of opening the file in an application. The the Media type, also called the MIME type or Content type, as configured by the web server, will determine what action Firefox will take.įirefox will not be able to properly handle a file if a misconfigured web server sends it with an incorrect content type. When you click on a link to download a file, you may see a dialog asking whether you want to save the file or open it with a specific application, if there is no download action already set for that file type.
4 Resetting download actions for all content types. 3.3 "What should Firefox do with this file?" prompt does not show an application. 3.2 "What should Firefox do with this file?" prompt. 2.1 Set Firefox to ask you what to do for files with no set content type and download action. Read more on each process here for SharePoint On-Premises and here for Office 365. 
Office 365: IRM simply needs to be turned on to begin using it. Configure in SharePoint to begin using it. #How download aspx file windows
SharePoint On-premises: IRM is a Windows Server feature in Active Directory. As stated by Microsoft, IRM is used to "help control and protect files that are downloaded from lists or libraries." If your goal is to prevent users from downloading files, but still let them open files, you need to configure Information Rights Management for SharePoint (IRM). they will get "Access Denied".Ĭonfigure IRM to Protect Content and Prevent Downloads If users try to open a document via a real direct link (e.g. If users try to open a document via a “durable link” (where someone copied a link with the doc redirect path) it will not work. Users will not be able to find these documents in search results. Other side effects to using View-Only include: The "download document" button will not be grayed out in the ribbon. Other files, such as PDFs and certain images, will still prompt to open locally.Īdditionally, "download here" does not mean any download will be blocked it just means downloads will be made to the local Office application. Users will be able to open files if you have Office Online Server / Office Web Apps (the server-side handler mentioned), but this only applies to Office files. Meaning, users will be able to browse libraries and see the files, but they will not be able to open them using Word or Excel on their computer. File types that do not have a server-side file handler (cannot be opened in the browser), such as video files. Any document that has a server-side file handler can be viewed in the browser but not downloaded. 
If we read the documentation from Microsoft on SharePoint permission levels, we find this description for View-Only:
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