Absolutely not - and I didn't mean my post to come across as negative. If this is purely a feature intended for power users - or if the whole piece of software

Absolutely not - and I didn't mean my post to come across as negative. If this is purely a feature intended for power users - or if the whole piece of software is intended for them - then that's totally fine. Aside from the slightly meaningless strapline, a lot of the copy on the Vivaldi homepage is definitely promoting the sort of customisation only power users care about - so perhaps you're bang on the money there. From my own perspective, I can't quite decide whether I'm not a power user because this feature doesn't much interest me (which I'm fine with), or whether it would interest me more if I actually tried it; I guess I am interested in the product journey that led to this being built, because it is clearly a large amount of effort for a - to me - quite unusual tent-pole. Likewise, for me, it's hard to see a doughnut chart of "Link transition types" as anything more than a novelty that you would look at once and then hide.