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VerticalTabs
Replaces the old horizontal tab layout with an attractive new Vertical Tabs layout for Windows.
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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.
I'm considering to get used with vertical tabs. so I won't got shocked how vertical space wasted later on. you can check this one https://github.com/astroryan12/VerticalTabs so far so good to me
I think the years while they kept the support was the "trying really hard". Developers can still use WebExtensions Experiments like https://github.com/numirias/paxmod does.