Hi, can someone please help. I just updated Firefox this morning to version 139. Then went to a bank site to download a CSV file of transactions - something I've been doing for many years. I click the button to 'Export Activity (CSV)' and then a pop-up window comes asking me if I want to open or save the file. Another window opens, headed 'Enter name of file to save to' and shows me the folders and has boxes at the bottom 'File name' and 'Save as type'. Here is where the problem starts. The 'Save as type' box usually has CSV in it, but now it's greyed out. The only option there is 'All files'. So I have to select that, and after I press OK then another window comes up giving the folder path and filename and saying 'File not found, Check the filename and try again'. I also get a Windows Security message saying 'Unauthorised changes blocked, Controlled folder access blocked firefox.exe from making changes'. I should stress again that none of this has ever happened before so I suspect it must be related to the Firefox update. I was able to download from the same site on Microsoft Edge with no problems.