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/ https

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