How to change the font in Yahoo Mail permanently?

I am using Firefox and the font set by mail options in my emails does not stay permanent. The fonts at size 12 gets high lighted when I open another tab and comeback to my email. When you sign out, then comeback and set the mail options, it works, but...

I don't want to have to change my font to a certain color or font or size every time I write an e-mail. I want it the same every time for every e-mail I write.

For some reason, the font on my Yahoo mail from Yahoo groups has changed to a typewriter basic font that is absolutely horrible. What caused it to change, and how do I get it back to the old font?

I changed the template color from my Yahoo mail page into pink and now, all of a sudden, without my interference, the color of the font for incoming mail has changed to a light pink, which makes my incoming messages virtually unreadable... How can I...

I only have dial-up available in my area, so I have to use Yahoo Mail Classic. It takes too long to download the new Yahoo Mail. But, the font in Mail Classic is huge! It takes up the whole screen. How do I change the font size?

ok yahoo mail...i have found where you can change the font but there are only a few choices. i want to change it permanently, not every time i write an email. when you choose a font ...show more

My computer was rather slow opening Yahoo mail up yesterday and when it finally did the font of the mail and everything else (yahoo news etc) was quite large. I can't figure out how to change it back.

I do not know how to change the font size in my yahoo mail. It is way to large and I have no idea how it got that way. Please tell me how to change it. Thank you

I do not have tool buttons in standard Yahoo mail or the Beta mail. I can not find a setting to add back the tool buttons so I can change font style and color in my mail messages.