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thunderbird-conversations
An extension for Thunderbird that allows you to view threads as "real" conversations, including your own emails. This extension also adds a bunch of useful UI features in the conversation view.
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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.
4. Conversations I have used for a very short time that extension many years ago. It seemed to work correctly (at the time), but I didn't like the feel of it, so I removed it. When you installed the extension, did you follow all recommendations? I am assuming you have installed this extension. Read carefully the Wiki to make sure you have installed it correctly. Check especially the addons that it replaces as well as the incompatible add-ons. From memory, when you install that extension, it tells you exactly what settings you have to select so it works correctly. if you haven't followed these instructions, then Thunderbird Conversations might be the culprit. Apart from that, since I don't currently use this extension, I won't say more about it.