Change YouTube leftbar's subscription links to channel/user video page. This script can optionally also move updated links to top of the list (if there's enough space), optionally uncollapse all updated links which may extend the non collapsible links, and optionally display the number of updated & total links following the "SUBSCRIPTION" section label. All features can be enabled/disabled from the script code. For new YouTube layout only.
Thank you! It was enough for me that this script changes each channel's link to "Video" tab. I dislike that most youtubers don't put recent on top, where it should be (more of an issue with YouTube itself, actually).