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tampermonkey
Tampermonkey is the most popular userscript manager, with over 10 million users. It's available for Chrome, Microsoft Edge, Safari, Opera Next, and Firefox.
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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.
Yes, I'm having the exact same problem. It was updated on Nov. 30 and I can't find a way to downgrade back to the last version. There's been several issues posted on the tampermonkey github recently but I don't have enough technical knowledge to know if any of those issues applies to this problem. And just like you, I can't even see my scripts to move them to a different script manager.