After upgrading to FF 4.0, videos from "http://www3.nhk.or.jp/daily/english/16_25.html?play" no longer play, no error messages, nothing.
After upgrading to FireFox 4.0, I noticed that videos from NHK no longer played for their "top" and "other" stories. IE still played them. I used "plugin check" to upgrade Java and Flash Player, as suggested, but still no video, and Firefox ran very, very slow, even after re-booting. I uninstalled Firefox 4 and then re-installed version 3.6.17 and videos played just fine, as before the upgrade to 4.0.
Wšykne wótegrona (1)
I've just tried to play the video @ http://www3.nhk.or.jp/daily/english/17_34.html but get the same problem.
Hang on until one of the Mods come along, I'm sure one of them will know the answer.