Yeah there is a teaser trailer out there for House of Lee: https://inv.nadeko.net/watch?v=u-4mqqr4psE https://www.shibuya.film/shows/house-of-lee

Im not sure if it is foss (have to check) but Soul Browser is my favorite. Packed with features and highly customizable, most if not all of your requirements are possible within this browser.

Did you try to switch to another instance?

And could Grayjay be another alternative to freetube?

(Edited, typo)

I like the new design of the App Menu, I hope they will add a few features of Cinnamenu too while they are at it. So far looking good!