I'm using firefox 74 on ubuntu 20.04. I'm facing an issue with my firefox browser since a long time when dowloading file or attachement. The download is completing but the file or attachement appear with a generic file name without extension. Everytime I need to go file browser or terminal console and change the file name and extension to the correct one prior to open the file. I tried to reset the firefox browser but it doesn't solve the problem. Attachement below for your reference.