What email service are you using? Try re-saving your Font size.

It's not the font that makes it faster to read, really, it's that it's in text mode. The Courier is easy to read because it doesn't use proportional spacing, has clear serifs and draws well, which also makes it fast to read, but the main deal is that without HTML and images, it just draws a lot faster. My point in mentioning it, however, was to point out that it's local settings that determine how your message will be seen, not what you see on your side. If the reading program doesn't find Georgia installed on the local system, it'll look either for the next font by alphabet or, if a family is specified, the first on on the list that it finds installed will come up.

Thanks bbbluz. Have tried all on the link you provided. Did improve a couple of problems, but the darned "Bookmarks", toolbar and tabs remain teenie, tiny and barely readable. I'm using FF 38.0.1 and OS X Yosemite 10.10.3.

Do you use reading glasses as sold at drug stores? Not intended as a snippy comment, if you don't maybe you should. And you may need a higher power of magnification for PC use than you'd use for general reading. Many do use them for PC screens - images and fonts can be hard to read, that's a common problem for seasoned citizens. As for me, my near-sighted self wears glasses with progressive lenses for close vision but with some laptops, I need to take my glasses off because the distance can be too far for the reading part of the glasses and too close for the distance part. Often I need to move the screen back and forth until the images are clear. Maybe some of these tips can help you.