One of the headline features maturing during this version was the ability to save videos for offline viewing. While this feature is now standard (YouTube Premium), version 5.9 was part of the early rollout where users could tap a "Save" icon to download a video for a short period (usually 48 hours) to watch without a data connection. This was a game-changer for commuters and users with limited data plans.
It utilized instant search suggestions and voice search, which were evolving rapidly at that time. youtube version 5.9.0.13
It is easy to forget, but during the era of version 5.9, Google+ integration was still a priority. Comments and sharing were heavily tied into the now-defunct social network. Opening the share menu in this version would prominently feature Google+ circles. One of the headline features maturing during this