There are few browsers that break large download files into smaller downloads and assign each portion a .part extension. These files can be seen in the “Download" folder. Once the download is finished, the browser will combine all the PART files to give a final downloaded file. For example, while downloading a file from Firefox, the download manager will store the data being downloaded in a PART file and replaces the name with certain characters, and add a .part extension at the end, such as doodle.or becomes JKzMn.or.part. After completion, Firefox will remove the .part extension and the file will be ready to launch.