Allows you to force open download links in browser itself, without saving to disk, supports customization
Allows you to view files from download links such images, audio, video, etc (that are supported by browser) with new browser tab, by forcing not to download files to disk. For example, if you are working online, and someone sends you some screenshots, and when you click on download links, the server may send download command to the browser which makes it save that file to your downloads folder and then you have to open it. After viewing these files are of no use and act as junk. By removing some headers sent by the server to browser, it makes it show the file in the browser itself. However one can save it to disk manually.