I don't know if this is a problem with my browser preferences or with how the browser sees certain websites. In Preferences, I have the box checked for "Allow pages to choose their own fonts, instead of my selections above." It's been checked for as long as I've been using Firefox. (Now using 6.14) Now, for certain sites, this no longer works -- the site always comes up using my default fonts. Since I'm trying to tinker with CSS on one of these sites, it's very annoying not to be able to see what I'm doing. The page looks fine in Safari, so I'm fairly sure the problem is with my computer rather than the website. This only happens with some sites. I have no idea why it would do this to some sites and not others. Some sites display their own fonts just fine. This started happening just a few day ago (but before I upgraded to 6.14). Shutting down and rebooting the computer doesn't help. Clearing the browser cache and quitting and restarting Firefox didn't help either.