It looks like the state-run museums (Firenze Musei) will be on strike from today, Sunday 5 December through Tuesday, 7 December. These include the Uffizi Galleries, Accademia, Palazzo Pitti, Bargello and others. Some of these (e.g. Uffizi, Accademia, Bargello) are closed on Mondays anyway.
Maybe someone - hapagirl? - can give us an update. I tried calling but no answer today. Thought of going over to the Uffizi this afternoon but the cold, clammy weather outside and the warm friendly fireplace inside made me change my mind ;-)