YouTubeCenter
                                YouTube Center is a userscript designed to expand the functionality of YouTube. It includes the ability to download the video you're watching, auto selecting your preferred video quality and much more.
                            
                        How to download and setup YouTubeCenter
Open terminal and run command
                                            git clone https://github.com/YePpHa/YouTubeCenter.git
                                        
                                        git clone is used to create a copy or clone of YouTubeCenter repositories.
                                        You pass git clone a repository URL. it supports a few different network protocols and corresponding URL formats.
Also you may download zip file with YouTubeCenter https://github.com/YePpHa/YouTubeCenter/archive/master.zip
Or simply clone YouTubeCenter with SSH
                                            [email protected]:YePpHa/YouTubeCenter.git                                    
                                    If you have some problems with YouTubeCenter
You may open issue on YouTubeCenter support forum (system) here: https://github.com/YePpHa/YouTubeCenter/issuesSimilar to YouTubeCenter repositories
Here you may see YouTubeCenter alternatives and analogs
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