@xvertigo: Please create a ticket at support.jdownloader.org. We need additional details and, if possible a TeamViewer session to find out what's wrong. Please include example links.
@bici-boci: We replace the firefox.xpi after we are sure enough that the extension is working on most setups and sites. If you really need to directly download the xpi for 3.3.14, you can find it here:
https://extensions.jdownloader.org/f...-3.3.14-fx.xpi