Hi, The problem I have is that when i download a screenshot in Firefox, left click the download arrow in the top right corner, click on the file, I get a message that says "the app didn't start". Never had the problem in November but seems to have happened after a Firefox update. I have the most current updates for Windows 10 pro 64, Firefox has been removed and reinstalled, Comodo was disabled, Strong VPN was disabled, browser privacy was set to standard, I have set up a separate folder for Firefox downloads and get the same message. I should note that these are all .png files. What app do I need and is it a Windows or Firefox app? Thank you for any help.