Regarding, the sailfish browser, please note that it became open source at an early stage of SFOS development: Sailfish OS 1.0.3.8 from 2014 afaik. I believe the absence of PRs justified sadly some of the Jolla board to stop open sourcing.
(something to keep in mind too is that one reason not to open source (from a pure financial aspect) is the need then to have more resources to read and comment the different PRs from the community. And resources is not that great at Jolla)
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