I have homeassistant up and running on a raspberry pi 3b+
I install docker on my pi & ran the image from “docker pull jlesage/firefox”
Refer https://hub.docker.com/r/jlesage/firefox
You can now go to http://your_pi_address:5800 from your ipad2.
You will get the latest firefox instance where you can open the homeassistant url on the browser.
Its clunky, but working.
FYI, i have ipad 2 running ios 9.3.5