Current versions of Firefox hide the protocol in the URL bar. To add it back, go to about:config and change browser.urlbar.trimURLs to false
If you find cursor blinking is back on, go to Applications -> System Settings -> Keyboard and untick the Cursor Blinking check box.
X no longer emulates 3 button mice by default. You can enable it either globally with a xorg.conf snippet, or per user with xinput.
With xinput, find the device you want to enable 3 button emulation on with
$ xinput list
The entry your looking for will be the string identifier under Virtual core pointer
Cirque Corporation USB GlidePoint
Then, to enable 3 button emulation execute the following
$ xinput set-prop "Cirque Corporation USB GlidePoint" "Evdev Middle Button Emulation" 1
To have this done at login, open up gnome-session-properties and create a new entry called Emulate3Buttons and put the xinput command you used above in.
Or more simply:
$ gsettings set org.gnome.settings-daemon.peripherals.mouse middle-button-enabled true
If most of the icons have disappeared in gnome-shell and applications can't load images. Try the following.
# yum reinstall shared-mime-info
If you find you can't change the desktop background unless you have nautilus handle the desktop.
Open up dconf-editor and go to org -> gnome -> settings daemon -> plugins -> background and tick the active checkbox.
This may effect GStreamer apps in general. An error about unable to create a playbin element.
Remove ~/.gstreamer-* directories.
Open up an xterm and kill your gconfd-2 process.
Remove ~/.fontconfig and ~/.fonts.conf
If like me, you have
Either remove it, or change either the gpaste, gpaste settings or the window key combo.
# mkdir -p /etc/dconf/db/local.d/locks
# echo -e "[org/gnome/settings-daemon/plugins/updates]\nauto-update-type=\"none\"\nfrequency-get-updates=0" \
# echo -e "user\nlocal" > /etc/dconf/profile/local
# echo -e "user\nlocal" > /etc/dconf/profile/user
# dconf update