I have not tried this extension yet, but if it does as advertised I will be happy to be able to download only audio, video to be used in PowerPoint. The savings in video memory could be further realized by just screenshot in the video and placing it into a PowerPoint slide. Kudos to the developer!
Great add-on, it brings solution to a need I've been having for a long time. Unfortunately, it keeps malfunctioning every third video : while it is clearly playing, the audio will just not work, everything goes mute.
I will most certainly give the fifth star if it happens to be a casual bug easily fixable.