Let's say you want "Roboto" and "Open Sans" to be available for your authors in JCE font-family drop down.
First :
Find your fonts in google fonts and add to your editor CSS stylesheet the @import you get from them.
For this example, it looks like this :
@import url(http://fonts.googleapis.com/css?family=Roboto|Open+Sans);
Second :
To remove/add fonts in JCE you need to go to the Typography tab in the editor parameters. For joomla 3.2 the path is :
Component > JCE Editor > Editor Profiles > choose the profile you want
to add/remove fonts from > Editor parameters >typography.
Scroll down to "Fonts" and you can start by unticking the fonts you want to remove.
Then you can add new fonts to the list by clicking on "add new font..." enter you font names, save and that's it.
Browser compatibility :
The google API is compatible for the following browsers :
- Google Chrome: version 4.249.4+
- Mozilla Firefox: version: 3.5+
- Apple Safari: version 3.1+
- Opera: version 10.5+
- Microsoft Internet Explorer: version 6+
Source