@NoMich, I think it's you. If you're using FireFox 3.x, whenever you increase/decrease the font for a site, FF remembers it for later, just for that site. On a Mac, the magic keystroke is cmd & + at the same time to increase the font, cmd & - to decrease the font, and cmd & 0 to reset it to the site's default size. I'm betting that on Windows it's ctrl & +/-/0.
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@NoMich, I think it's you. If you're using FireFox 3.x, whenever you increase/decrease the font for a site, FF remembers it for later, just for that site. On a Mac, the magic keystroke is cmd & + at the same time to increase the font, cmd & - to decrease the font, and cmd & 0 to reset it to the site's default size. I'm betting that on Windows it's ctrl & +/-/0.