I have this download item in my Downloads window. The problem is that it has hung around there without any certain directory anymore. All the options at right-click menu would not take effect--except for 'Open Containing Folder' which is not available. I have a strong confidence that download is registered somewhere in Firefox that might be resolved manually.
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You can try to delete the downloads.sqlite file to clear up the download history.
You can use this button to go to the Firefox profile folder:
- Help > Troubleshooting Information > Profile Directory: Show Folder