In Mozilla Thunderbird, Netscape and Mozilla, that's no problem. You just shrug and increase the font size with a mere keystroke. Here's how:
Read a Message in a Larger Font in Mozilla Thunderbird or Netscape
To increase the fonts size while reading a message in Mozilla Thunderbird, Netscape or Mozilla Seamonkey:
- Open the message.
- Press Ctrl-+.
- Repeat this to further increase the font size.
To go back to the original size, either press Ctrl-- (multiple times) or select View | Text Zoom | 100 % from the menu.
To further customize your reading, you can also choose your favorite font and color for displaying messages.

