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Previously Firefox would show a number at the end of the file name (renaming the file by adding a number) showing that I had already downloaded a file at least once before. Recently that isn't happening. How do I get that feature back?

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When downloading, previously Firefox would show a number at the end of the file name (renaming the file by adding a number) showing that I had already downloaded a file at least once. Now that isn't happening. How do I get that feature back?

When downloading, previously Firefox would show a number at the end of the file name (renaming the file by adding a number) showing that I had already downloaded a file at least once. Now that isn't happening. How do I get that feature back?