Same Font for all messages in OS X Mavericks
By default, sender and receiver get into MacOS X, different fonts. You can bind to, but with just a few clicks at:
- On your Mac, open the "messages"App.
- Then click on "messages" and select the entry "settings".
- Switch to the tab "presentation".
- In the case of "sender's font", select instead "Automatically" to your desired Font. On "Other" if you have a larger font selection.

Same Font in messages
Read in another practical tip on how to use the messages App for your Facebook Messages use can.
