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It would be nice to have a drop-down menu with undo / redo / settings. Sometimes it may be necessary to make quick changes (e.g. when needing to use more than one color in the same text).

이 검토는 현재 부가 기능의 이전 (7.0.0) 버전에 대한 것입니다. 

Undo and Redo are standard functions in Thunderbird: "Edit"--> "Undo" or CTRL+Z and "Edit"--> "Redo" or CTRL+Y.

Most users set their preferred colours in the settings dialogue only once or at least change it not very often, so the "normal" way to go to the settings dialogue should be sufficient.