How to adjust Windows 7 Background

Please Disable Tracking in Firefox so that my ad revenue and sharing widget are not blocked.  Thanks!

You can see a shield icon at the left end of the location/address bar when you are in private browsing mode that some content is blocked.
 Method 1
Left click the shield and click Disable Tracking.
Method 2
Disable this feature in "Options/Preferences > Privacy".

• Options/Preferences > Privacy: "Use Tracking Protection in Private Windows"

1.  Right-click any open part of the desktop screen.
2. Click Personalize.
3. Click Desktop Background.
4. Click Browse.
5. Find the location of the picture you want to use and click OK.
6. Put a check mark in the picture you want to set as the Windows background.