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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.
Strict ETP block fingerprinting scripts, which is great. RFP on the other hand does a whole lot of things. It changes your time-zone to UTC, spoofs your resolution, user agent, language, canvas data, and much, much more. It also does break a lot of sites. If you want to "max out firefox", I'd recomand Arkenfox or LibreWolf, both of which get you very far in terms of a private browser.
I wish this was more configurable, some canvas-based app do not work with this option enabled :c (for example it appears to be the case with mapbox based games : https://www.qwant.com/maps)