I have a mini-PC from Minisforum (not this one) dedicated as a media computer in my living room. It can fit nicely inside the TV bench, which a regular sized computer wouldn’t do. I like that I can play games like Horizon: Zero Dawn on it without any issue. I love it, and I gave about 800 USD for it.
I am planning getting a high-end rig for my office later (next year maybe?), and then I of course will not consider a mini-PC.
I experience little breakage with Librewolf, and when I do, maybe 75-85% of the time it is because the site only works with Chromium. I get extensions directly through the browser, I have not enabled anything as far as I am aware. And of course you can configure the cookie clearing. I quite like it, there are (in my case at least) not many exceptions you need to add before it works quite smoothly, but of course that depends on your usage.