Yeah them hijacking CTRL+F is kinda weird. But I don't often search that way on the forum.
So I finally looked at the desktop view and I still sort of have an issue with the way that it highlights new content for a thread in a similar way to Vanilla where it tries to bold the title, but it's not a strong bold. So it's kinda hard to see. Sometimes it will show you the blue circle but I haven't really figured out when that happens.
EDIT: Oh it seems to wait until you "follow" something which happens automatically when you reply to something... that's kinda an interesting idea.