MAmaheart·Apr 16, 2018
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.
In Jolla is the last company with an 'alternative' mobile operating system