User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.1b2) Gecko/20081201 Firefox/3.1b2 Build Identifier: As above I have yet to test this in nightly branch 3.1b3pre or trunk 3.2a1pre Tests of those versions on non-windows OS are welcome. Reproducible: Always Steps to Reproduce: 1. View the attached html file that will hopefully work with attached ogg and png file. 2. Press Alt Shift X (or equivalent combo for X as accesskey) to focus subtitles 3. Press S to toggle the background animated spiral while audio is playing (any other key will pause/unpause the audio) Actual Results: Audio stutters, and greatly slows down, then when the aPNG image is gone it skips ahead to where it would have been if it hadn't stuttered/slowed down. Expected Results: Audio plays normally.

Seems that you forgot to upload the attachment.

The attachments on this bug are used to troll internet forums such as Slashdot. See this Slashdot post for example: http://science.slashdot.org/comments.pl?sid=1134635&cid=26926859 Please close the bug and delete the attachments. Thanks.

To see box shadow inset causing stutter resize the browser so it's wider than it is tall (landscape) and hover the mouse over anything. If you have javascript turned off the audio will automatically start, otherwise click on step 3. Resizing the browser to be thinner than it is tall will remove the box shadow inset and audio won't stutter when mousing over things.

Can you please retest this with a trunk nightly? It should behave much better now.

Please re-open this bug if the issue persists. Matthew Gregan mentions in comment 8 that it should be much better now.

Duping as per bug 704450 comment 18