The 'How to' videos have never worked for me in firefox 3 but worked perfectly fine on opera and IE7 and currently work on the IE8 and google chrome beta's. I've uninstalled/reinstalled firefox and flash (using adobe's uninstaller) to no avail. To be fair on the What Hifi site I have had firefox/flash issues on other web sites. I know the firefox flash plugin has been buggy in the past but I thought adobe had sorted it out.