Can you give an example of a website that breaks with an adblocker? (Please describe what breaks as well. Otherwise I might not notice it.)
Now that I think about it, if a site wants people to disable adblocking, they should make valid contents disappear instead of begging for it with a popup.
Vangaurd's login page doesn't work with adblock (completely doesn't show it)
Don't have other examples off top of my head
For the ones you mentioned, Vanguard seems to have a lot of different login pages, but every one I found actually rendered - although some were white for so slow I wondered if they would fail. But not trying Uhaul because obviously I don't want to make a transaction.
Update: On first impression that does not seem to have worked.
I also find it annoying that I lose access to my entire Firefox ecosystem on my computer and phone since the focus of the app is actually on anonymous browsing versus blocking ads. If I send tabs to my iPad they still open up in regular Firefox. Firefox Focus only slightly makes the web useable, while giving up most of the browser conveniences.
