Try it in any browser and you'll get the same answer. see screenshot What are you trying to accomplish?

I could be wrong, but I think the name tells you what it is, a service that you cannot browse. Here's an interesting article about the site. https://icenineonline.com/blog/googleadservices-com-google-analytics/

^: the screenshot posted above merely means that you didn't provide a link to a valid/existing page (i.e. you get a 404 page not found error).

I think that googleadservices.com normally would be blocked in Firefox by ETP, you can search the about:url-classifier page for googleadservices.com