I'm the one who started this discussion, and with the help of some advice I got a while ago, I've finally gotten the Firefox menu bar fonts to behave the way I want them to under KDE. The solution I've adopted does not involve any fiddling with DPI; I assume, possibly wrongly, that the reason the fonts are small is that the Gnome defaults are deliberately chosen that way. You need to have gnome-control-center installed. Go to gnome-control-center and select, in an obvious way, the font and size that gladdens your heart. You can choose the face as well as the size -- something that DPI twiddling won't give you. Start up Firefox and you'll see the font you want -- but it won't persist between sessions. To make it persist between sessions, you need to do one more thing: insert into your ~/.xinitrc file the line gnome-settings-daemon & Now all will be well for the rest of your days. Paul