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user.js
Firefox privacy, security and anti-tracking: a comprehensive user.js template for configuration and hardening
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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.
It is recommended to keep extensions to a minimum, only use what you really need, I won't check them one by one for you, but I can tell that most of the privacy-enhancing extensions you listed are unnecessary: https://github.com/arkenfox/user.js/wiki/4.1-Extensions
Give this a look as well, contains what I mentioned above and also has more cool stuff related to FireFox.