Could be programs you are using or anything causing issue as some browsers are tricky with things.
Wish I knew a lot with the browsers but always here things work better in this browser and that but I have issues with even the others when I switch as the programmers say this works better with Firefox, or google or ...
You really need to put a test page on your web server to test this properly. I have not tried the embedded version so I can't comment in detail but I do know that some embedded code from Amazon doesn't work when I test the pages locally in Firefox.
