Vivaldi can do tab tiling. Not nearly as customizable as an IDE as you describe, but you can vertically or horizontally tile multiple tabs on the same "page". Only browser I know that has that close of functionality
What are your impressions of it?
I use an ultrawide 32" screen and even for window tilling I use PaperWM (technically a Hammerspoon script because PaperWM isn't on MacOS). So I only need to navigate windows/tabs in one dimension (horizontally).
Arc does have the benefits of native UI, Vivaldi at least when I tried a couple of months ago was very janky, presumably because the browser chrome is written in React.
Somewhere in this thread people mentioned Stack browser which is actually closer to PaperWM in terms of how it tiles tabs. For both Arc and Vivaldi it's very annoying if you resize (going fullscreen and back) windows with tiles because the size of the tiles gets messed up. Stack just keeps the size and make them scrollable.