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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.
Brave will continue to support Manifest V2.
Additionally, I bet that the actual market share of Firefox is even lower than those 3% shown elsewhere. For instance, all of the SearX instance on https://searx.space present themselves as Firefox to upstream engines. For each search request, several engines at once are hit by a Firefox User Agent, artificially inflating Firefox's statistics.
Not quite the same thing, but I'm a big fan of hblock for a similar effect on a per-host basis.
Another option is use RethinkDNS, it can be used with free tier CloudFlare, and quite easy to set up. This way, you can add any filter as you see fit. The downside is that you can't create your own customized filter to whitelist / blacklist what you want.