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uc.css.js
A dark indigo CSS theme for Firefox and a large collection of privileged scripts to add new buttons, menus, and behaviors and eliminate nuisances. The theme is similar to other userChrome stylesheets, but it's intended for use with an autoconfig loader like fx-autoconfig, since it uses JavaScript to implement its more functional features.
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firefox
Torturing Firefox with userchrome.js and userchrome.css in response to Mozilla's successive degradation of the browser window. (by Thomashighbaugh)
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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.
A good place to start
What I did with the above