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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.
When I first moved Georgia over to Spider Monkey I had the same popups when starting foobar with my HDD spun down. I discussed a lot with TheQwertiest who maintains FSM, and ultimately he came to the conclusion that nothing could be done on the Spider Monkey side of things. That meant I had to rearchitect the theme to load files asynchronously so that it wouldn't block everything when including files. Unfortunately that's probably not going to be something you can fix on your own easily.