Yahoo mail - font size increases with each "Enter" - *possible solution*

I'm reviving this issue because a previous unresolved thread on it was closed, and I have a solution that works for me.

The issue is in Yahoo mail. When composing a message in full HTML mode, the font size increases with each carriage return (new line or "Enter").

(This is still a problem as of June 2013 and the current version of Firefox for Mac - version 21.0)

The solution that works for me is:

View > Zoom > uncheck Zoom Text Only

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