User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:13.0a1) Gecko/20120201 Firefox/13.0a1 SeaMonkey/2.10a1 Build ID: 20120201003009 Steps to reproduce: upgraded to nightly 13.0a1 (20120201) and tried to play flash videos Actual results: no flash playing. Tried to restart the browser with add-ons disabled: The flash player works. Tried to manually disable all add-ons (noscript, adblock+, videodownloadhelper) in a normal sessions, then flash works only when all add-ons are disabled at the same time. If only one add-on stays enabled, then flash does not work. Expected results: normal flash video

See in the mozilla.dev.apps.firefox newsgroup: <To2dnUgAoN8yHrTSnZ2dnUVZ_tednZ2d@mozilla.org> Hi Dominique Yesterday https://bugzilla.mozilla.org/show_bug.cgi?id=90268 landed, which I imagine would be the culprit. If disabling all extensions and restarting Firefox resolves the issue, see https://bugzilla.mozilla.org/show_bug.cgi?id=723154 , if the site is Pandora then https://bugzilla.mozilla.org/show_bug.cgi?id=723164 , and failing that, we'd be really grateful if you could file a bug marked as blocking bug 90268. This link should fill out most of the important fields, to save some time: https://bugzilla.mozilla.org/enter_bug.cgi?blocked=90268&component=Plug-ins&form_name=enter_bug&keywords=regression&product=Core&version=Trunk Hope that helps, Ed