The Zen browser - a derivative of Firefox, also supports split tabs (and a lot of others like spaces, vertical tabs and glances). The project seems fairly active and up to date in the past few years.
I've been using Brave at work for my default browser but Firefox for personal things. I've been really impressed by Brave and so, since the Firefox news, I have decided to use Brave as my personal browser. I understand it's chromium based which is a non-starter for some but that it's open source and that Brendan Eich isn't a Google fan makes it tenable for me to try.
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