BANGKOK: -- Thai Immigration has confirmed to Thaivisa.com that it is now possible to make your Notification of Staying in the Kingdom over 90 Days online! Currently the system only works with Internet Explorer but it will be possible to do your 90 day report with other browsers soon.
Although it says it only works with IE
i was able to get it to open using firefox 36 with no problems
( just click ok when the box opens telling u it only work in IE)

Good work Immigration!!!

http://extranet.immigration.go.th/pi.../TM47Action.do