Autostart html page not work on firefox at all

Hello .I created autostart html page but when i put command open new tab with link , then error message shown “Illegal URL: file:///C:/…” .This happens on firefox .But i see latest version UI of firefox is very old . Is project abandoned on Firefox ? Autostart seems not work on this version.
If i put the link manually to firefox, then page loading.So it is problem of UI vision.