Shocked by paltry RSS feed (no OPML export, no Android sync)
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Vivaldi can hardly claim to be/feature an rss feed if it can't export that feed (principle #1 of data transparency and personal sovereignty). Meanwhile, It's somewhat unacceptable for such a valued feature to just be unavailable on mobile imo. I'm hugely disappointed that these issues have remained unaddressed for so many years
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Until they do add it, you can use this:
https://forum.vivaldi.net/topic/59763/opml-export
Works for me.