I use Pale Moon 27.6.1 64-bit, DownloadStudio 10.0.3.0 (from Conceiva), and FlashGot 1.5.6.14 (probably the most recent version compatible with PM). When I have FlashGot set to download media using DownloadStudio and try to download YouTube videos, DownloadStudio commonly gets confused and downloads videoplayback instead of the video. Do you know of an issue that might be causing this?