Thunderbird email - Font size changs on its own as I type

Dec 8, 2013
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Imac, OS X 10.9.4, 2.7 GHz, 8 gig Ram.
When writing an email with Thunderbird, the first line prints out at my normal font size on the screen. Usually by the second line, my font is reduced by about 2 pts by itself- It just starts coming out smaller- I have to go back - highlite it, and raise the font size. Crazy!!! I have tried lots of different setting but none affect this problem.

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