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PopupWindow
Firefox add-on, move tab to standalone window, without tabs bar, navigation bar and bookmark bar UI. (by ettoolong)
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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.
As already mentioned - to get a separate window without unnecessary interface elements, although it goes with a price of unnecessary crap in the system, so mostly I just use this (open anything as temp "PWA"), but since MS doesn't allow devs to add entries to bookmarks context, using PWA instead of just toolbar-less window may save you one click sometimes.