My apologies for the late notice. There has been no testday scheduled for tomorrow. We are currently ramping up for the quickly approaching Firefox 13 release. If you would like to help out or have questions about becoming involved with testing, I will be in the channel all day (9am to 5pm Pacific). Feel free to join irc.mozilla.org #testday and ask me (ashughes) a question or send me an email.
We will have more testdays coming very soon.