Sounds like another reason to get that PiHole anti-ad DNS server @nothingfuture told us about.
Assuming the browser couldn’t dodge around that somehow.
FFS. I hope someone comes up with an add-on to delete those.
For security reasons, Firefox Quantum doesn’t allow add-ons to do anything with about:newtab, about:reader, etc.
It’s one thing to roll out and develop on live systems when you’re a hobbyist. It’s an entire different thing altogether when your project has effects on thousands or millions of people.
Whether your project is minetest, discourse, or Firefox, it pays to be mindful.
No, no, gotta add that new tab throbber. Maybe test varying flicker rates. But just because some people get sick doesn’t mean you can’t add that new tab throbber. Because pain is sexy. Besides, they can use user css to block it. If they can’t, well, you don’t support user css so it’s none of your responsibility.