With both galeon and epiphany, one cannot change a value in the about:config page. Double clicking a property pops up the value dialog, but clicking either 'Cancel' or 'Ok' does nothing. The only way out is to close the dialog with the window top-right close button, which doesn't apply the new value. This prevents for example changing the crucial DPI settings if the Xorg driver didn't detect the screen DPI correctly...
bug in GNOME's bugzilla: http://bugzilla.gnome.org/show_bug.cgi?id=521390
Yup, can fully reproduce with epiphany-2.22.0-4.fc9.i386. However, not sure about the component -- cannot reproduce at all with the real firefox.
Yes, it's very possible both galeon and epiphany make the same xulrunner API "mistake"...
Yeah, marking upstream and hopefully gets resolved there. Regardless, the DPI thing is fixed for F9 so you won't have to change it for that reason...