BTW to update this file I mounted the Nexus 4 on my Ubuntu Desktop - copied the file to my desktop and added the extra values and then copied it back to Documents folder
To actually update the file I mounted the phones filesystem as RW
mount -n -o remount,rw /
then copied the file to the path /usr/lib/arm-linux-gnueabihf/qt5/qml/Ubuntu/Components/Extras/Browser/ua-overrides.js
BTW to update this file I mounted the Nexus 4 on my Ubuntu Desktop - copied the file to my desktop and added the extra values and then copied it back to Documents folder
To actually update the file I mounted the phones filesystem as RW
mount -n -o remount,rw /
then copied the file to the path /usr/lib/ arm-linux- gnueabihf/ qt5/qml/ Ubuntu/ Components/ Extras/ Browser/ ua-overrides. js