Disable loading images in Firefox

Click Tools - Options

Click Content tab

Uncheck Load images automatically

Click OK

Take Screenshot in Windows XP

• To take screenshot press PrintScreen key 
• The captured image will be copied to clipboard
• Now open any image editor and paste the image by pressing ctrl + v or from option of the image editor
• Now save the file

• To take screenshot of particular window, open the desired window
• Hold down the "Alt" key and press "Print Screen"
• Now follow the same steps as above.

Disable images in Chrome

Click Customize and control Google Chrome button

Click Settings

Click Show advanced settings...

Click Content settings...

Click Do not show any images

Click Done