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 <Ctrl><Alt><H> set up to horizontally maximise a window and it no longer works. This is due to gpaste and its default of using that key combination to show the paste history.
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