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Try resetting the preference in about:config. įirefox can hang downloading files if the folder where Firefox is attempting to save the download no longer exists or is not accessible. If this doesn't help or if it also causes a hang, exit Firefox completely and delete the file downloads.sqlite in the Firefox profile folder.In the Firefox menu, click on "Downloads" (or "Tools - > Downloads") and click "Clear List" to clear the Download History. As the download history grows, files may take longer to download and Firefox may appear to hang when downloading.
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