For me, tab location is spacial in my mind, and so many years of having them horizontal makes it hard to switch. Somewhere between 25 and 40 I start having trouble finding things at which point I just close them all and start over. I do use the tab drop-down in Firefox, but mostly to more quickly find things I want to close. Also completion in the url bar to find specific open tabs is quite useful.
A little niche, but that would be handy while directing an a capella choir. Giving starting pitches without a pitch pipe or tuning fork would be useful.
I implemented those recursion rules (probably very poorly) years ago. I still often think about the ways I did and probably should have handled those. It was an interesting problem.
And for folks that do want to bury the body, it can be done way cheaper than the funeral industrial complex would have you believe. Our church keeps a simple coffin on hand that the family can use at cost. And we have folks who will prepare the body and bring it to the church. The only part we don't usually do is dig the grave. Cemeteries usually include that in the cost of the plot.
It has options to hide or obscure the location, which I use whenever I'm anywhere near my house, but it should be a little better about prompting users to use that.
Find an open-source project that has a react frontend and could use a tour, and create a PR for a nice tour using your library. Be transparent that you're the author of the library and you've done this work to showcase the capabilities of it.
I personally usually dislike that kind of tour and look for the skip button as soon as I can, so I'm not sure what sort of reception you'll see, so be prepared for it to be rejected. But then you can try again somewhere else (without getting spammy)