That's what the "old" bookmarks runner was doing, it loaded the bookmarks from the file the browsers write out.
REPOSITORYR856 Plasma Browser Integration
To: broulik, Plasma, VDG, davidedmundson
Cc: sebas, abetts, mart, ngraham, plasma-devel, ZrenBot, progwolff, lesliezhai, ali-mohamed, jensreuterberg, apol