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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.
The answer was not something I was expecting. I was expecting that I will have to refactor most of the logic to core and then have specific implementation for Chrome API and Firefox API. But instead, I learned that Firefox Addons(extension) support almost most of the API provided by chrome API. That meant, I didn't have to change almost anything to the logic implementation of the extension(better-github.js). Except a very minor issue which was just a one line change.