Firefox is adding a .part extension to my downloads and they won't open. Why?? Fix???

When I download a file, Firefox does 2 things: changes the file name to gobbledy-gook of letters and numbers, AND, adds a .part extension -- therefore the files won't open. This is a NEW problem. If I manually remove the .part extension in the download folder, the file will open, but I still have the problem of the name change. I believe that the .part extension is supposed to go away when the download is finished, but that does not happen. Also, my downloads always used to come with their original name, not a numbers/letters name. Thoughts?

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