In mine (Firefox 2), there's no "Preferences" under "Edit". I access font controls through Tools | Options | Content. The [Advanced] button in the "Fonts & Colors" section takes me to allowing or disallowing webpages to set their own fonts.

In Firefox (2, anyway) you can also change text size very quickly if you have a mouse with a scroll wheel. Hold down Ctrl and turn the scroll wheel. I haven't used this feature in a while but I seem to remember that it would affect all pages I opened in that "tab" for the rest of that session. If I opened additional tabs, the text there stayed at the default font.

I've successfully set the text size for window titles, icon labels, etc., in Windows but I think it only affects system stuff, not browser content. Anyway, I only know how to do it in Windows 98SE.

I looked around my PC Control Panel for anything to do with the appearance of posts, but there seems to be nothing there except "skins" (which affect mostly the color scheme and the markings on the buttons). If anyone knows of something I missed, please let me know.

Let us know which parts of this do and don't work for you, Paddy.