Качает видео со всех сайтов, которыми я пользуюсь.
Для полноценной работы требуется установить приложение-компаньон. Согласно касперскому, это приложение безопасно. Да и я активности никакой подозрительной не заметил. Конвертацию видео включать не вижу никакого смысла, да и водяной знак лепить в видео будет. Достаточно удобно то, что можно настроить автоименование файлов при скачивании. Из минусов - высокая загрузка CPU при скачивании нескольких больших видео одновременно.

good

Great app... Thanks. 100 videos downloaded and converted and renamed. Big job, 400 to go. Progress seems slower if multiple vids are downloading but i'll live with that for now. Donation after job completed.

Hey, it works and helped me download a lot of content. If there is any issue - it is that it can slow down your computer on older machines. May not be a problem for newer multi-core computers. Mine is an old Intel core I3 laptop, and I get by just fine with Video DownloadHelper.

Extremely versatile, works in a lot of cirucmstances, very few situations where it does not work. Only downsides are that it can make heavy use of your RAM, particularly when downloading large files, and that when a download fails it doesn't have an in-add-on option to retry the download; in some circumstances I've found the download can be restarted using firefox's own download UI. Haven't needed to use other video downloading tools since I installed it - if this can't do it, I doubt anything can.