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The official browser is actually Webkit based. I believe Maemo was the last OS in that lineage to use a Gecko browser (microB).

The official browser for SailfishOS is Gecko-based. The SailfishOS browser source code is FOSS, so we can see for ourselves, from https://github.com/sailfishos/sailfish-browser :

> Sailfish Browser uses Sailfish Silica Qt components for the browser chrome and gecko engine with embedlite Qt5 binding.

Oh, huh. I suppose I was mistaken. Thanks for clarifying that!