Font look differences between IE & FireFox

the growing number of users that use Mozilla Firefox made me think twice before optimizing my web-sites. I wanted them to look the same in IE and Firefox. Lets say ive covered 90%-95% of this problem because its a shame that Firefox doesnt support propertys like scrollbar-darkshadow-color but i`ll pass that.
After i did the research and solve the important issues the pages look the same in ff and ie but only at first sight. On internet explorer characters ar smooth and nice but in firefox the same characters at the same size look “pixelated”. Is there a way to solve this?

Anticipated thanks