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A proper Split View implementation
(lemmy.ml)
A place to discuss the news and latest developments on the open-source browser Firefox
That makes sense. I’m using Floorp, which already has many CSS tweaks built-in; however, it is pretty limited, as you saw in the gif. With Arc, you can have as many Split/side Views. It’s one of their main selling features.
I would have a look into it (just out of curiosity, I'm happy with Firefox), but it's proprietary and not open source.