How to block IMAGES in FIREFOX???

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Hi friends.... I need to block images in some sites...but i dont know how to block images in firefox...coz i dont want the images to load in all websites nd take my bandwidth.. i knew the images can be blocked in certain web browsers like avant,maxthon...but i always prefer firefox ...so plz tell me the addon by which the images can be blocked in firefox..and also tell me how to block images using that addon.. thanks in advance...!!!