I've downloaded the trial of Wondershare AllmyTube which is less than 30 bucks, but the Chrome integration doesn't seem to work. I'll check later if it works on Safari in the website I want to grab videos from. If it doesn't, I can either try the Converter Ultimate, or installing Firefox and using the Video DownloadHelper. This one is some sort of add-on with a complement you need to install too, but it's a bit complicated to get the video files working, you need ffmpeg and running a few commands on Terminal which is not my cup of tea.