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WebNowPlaying-BrowserExtension
Discontinued The extension to go along with the WebNowPlaying plugin for Rainmeter
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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.
You don't need spicetify at all for it to work, the skin comes with what you need save the browser extension. Also, if you're trying to use the latest version of spicetify, than that's likely what's causing the issue there as I don't think it's been updated for the newest version of spotify yet.
For help with spicetify specifically, their community is here or you can check their github issues page.