Kathleen your question is very brief... I am not sure if you want to change your font on your email client/or word document or Mozilla page?etc.. Here are some suggestions... if you want to change the size of your screen in Mozilla goto view up the top menu bar and use Zoom options. I find this very handy in some board games on FB etc.. Now on your email client you should have two drop down boxes on the Left hand side which show Text size e.g 12 etc and along side of this a Font option (mine is on Arial).. use the drop down menu to change the Font and sizes of your text. This will revert back to your regular size/font when you create another email or Word document. I am sure there are settings to change if you want to make other Fonts/Sizes permanent in the options etc but better to setup each time you do a new message.. If you do not have the drop down boxes in Word you might have that hidden. Goto view and use print layout on left hand side (in word 2007)..then go home on the same menu bar and your font and size drop downs will be shown. Another handy trick to change sizes of your screen is to press Ctrl ++ to increase size of your screen and Ctrl 0 to bring back to normal size screen.. This is very useful on the net when you have hard to read text or want to change your screen size for FB games etc.. Best of luck and will keep an eye on your thread.