[rohin15]

It's getting harder and harder to main Firefox. Brave's split tab feature is simple but so brilliant.

[goku12]

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.

[SavioMak]

Firefox has experimental split tab hidden inside about:config since 146.0 (December 9, 2025)

https://winaero.com/how-to-enable-split-view-in-firefox-146/

[Izkata]

A decade ago there was a Firefox addon called Tile Tabs that could do any number of arbitrary splits. It died along with all the old-style XUL addons.

[Dah00n]

1. Look for a new browser instead of Firefox that also have a history of being trustworthy.

2. Look at Brave - see 1.