If you have the latest FireFox browser install, you don't need to do this configuration. Please go to Mozilla FireFox website to download the latest browser.
After you save the USP10.DLL file into Mozila FireFox directory, Use the guide below to config it in order to view Khmer font correctly in FireFox Browser.
After you save the USP10.DLL file into Mozila FireFox directory, Use the guide below to config it in order to view Khmer font correctly in FireFox Browser.