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Please update for TB 3.1.* because it not works correct with this version. In the preview of a mail the button "other actions" works, but when I open a mail in this position the button "other actions" in the header has no function (please excuse my bad english)

Questa recensione riguarda una versione precedente (1.2.1) del componente aggiuntivo. 

Which version of CompactHeader are you using? Operating system? Any messages in the error console?
Could you please go to the support thread at mozillazine.org and post a more detailed description of the problem.