User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:15.0) Gecko/20100101 Firefox/15.0.1 Build ID: 20120905151427 Steps to reproduce: Typed "http://hpr.dogphilosophy.net/test/index.php" into address bar. Clicked on the "(click to try it)" button behind WebM Audio. After a couple seconds (when I'm sure the complete sample is loaded) I move the current position of the audio to the start (0:00). (but any position will do) Note: The file used on the site is attached. Actual results: The WebM audio stopped playing. I could not get the WebM audio to work again, only by changing the src of the <audio> tag, or by refreshing the entire page. Expected results: The WebM audio should start to play from the selected position.

The file doesn't contains a 'Cues' seek index, and Firefox does not support seeking in WebM files when such an index is not present.