How to download and setup wolfram-js-frontend
Open terminal and run command
                                            git clone https://github.com/JerryI/wolfram-js-frontend.git
                                        
                                        git clone is used to create a copy or clone of wolfram-js-frontend 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 wolfram-js-frontend https://github.com/JerryI/wolfram-js-frontend/archive/master.zip
Or simply clone wolfram-js-frontend with SSH
                                            [email protected]:JerryI/wolfram-js-frontend.git                                    
                                    If you have some problems with wolfram-js-frontend
You may open issue on wolfram-js-frontend support forum (system) here: https://github.com/JerryI/wolfram-js-frontend/issuesSimilar to wolfram-js-frontend repositories
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