Automatically change backgrounds in Xfce 4.10

1. download a list of background pictures
2. right click on the desktop, and choose "Desktop Settings..."
3. under "Background" tab, choose "Image list" on the right
4. click "+" to add background pictures to the list
5. choose "Change the background (in minutes)", and adjust the minutes
6. if you have one monitor, choose "Stretched" for "Style"; if you have two monitors, choose "Tiled", and choose "Stretch this background across all monitors"

Install Xfce 4.10 in Xubuntu 12.04

sudo add-apt-repository ppa:xubuntu-dev/xfce-4.10
sudo apt-get udpate
sudo apt-get dist-upgrade

Firefox Tip: Delete One Item From History

It is especially helpful if you type Gogle instead of Google, which makes Gogle recorded in Firefox history.

1. Enter the partial name in the url bar, say "Gog"
2. Select the error url

3. Shift + Delete