Some download managers are not yet fully compatible with Mozilla Firefox. To solve this problem, you have two options: sign in duplicates manually or use FlashGot.
FlashGot is an extension for Mozilla Firefox that will allow your download manager to capture links that you want to download before doing this by Firefox, so your browser will not download downloads, but your choice will be handled by the download manager.
FlashGot supports Gwget, WXDownload Fast and KGet.
It does the flashboard extension installed on your browser.
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