-
multi-account-containers
Firefox Multi-Account Containers lets you keep parts of your online life separated into color-coded tabs that preserve your privacy. Cookies are separated by container, allowing you to use the web with multiple identities or accounts simultaneously.
-
SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
Notice that not all functionality is available in brand accounts, e.g., upload your own music to YTM. There might also be some lost functionality when using the brand account at YT, but I don't know them anymore. You should also be aware that it is not easy to switch between different google accounts on PC because they use the same cookie to remember your current account. You can use a different browser for one of YT or YTM, or use add-ons like Firefox Multi-Account Containers. The different apps on android have no problem with this.