There are several sites that do not display properly or have interface issues. These same sites work properly with Brave or Chronic. One is insta card.co when trying to install a card to my phone. There is an overlay popup that should display instructions and links, but is blank on Firefox. Another is the Google business site used to verify a business profile especially when taking a video to verify the business location. The video controls don't work; can't start video, zoom, or switch main to selfie camera.