https://www.hardill.me.uk/wordpress/2016/11/25/auto-launch-webpages-full-screen-on-android/
Repository from Github https://github.comhardillb/AndroidWebAutoLaunch
A simple App to launch webpages at full screen when the device boots
You can access the settings menu by either swiping in from either edge, or long pressing anywhere on the page.
https://play.google.com/store/apps/details?id=uk.me.hardill.weblauncher
https://www.hardill.me.uk/wordpress/2016/11/25/auto-launch-webpages-full-screen-on-android/
Apache License 2.0