"" CANNOT LOAD IMAGES       OK

This does not happen in other browsers and it happens on a variety of computers I have access to and would seem to be a common problem but I can find no identical cases in my searches of Firefox , Facebook or windows help or Google search. My home machine is only a P2 with WINXPCORP but works fine and I have done all updates but still have this continuing problem every time I try to use Firefox to access Facebook chat but it does not happen with IE or chrome The response to clicking on chat button or friend chat is a black screen with small center square box with blue title bar that says '' VIEW IMAGE FULL SCREEN - (42) FACEBOOK X"" center of box is ""! "" mark in yellow triangle and wording "" CANNOT LOAD IMAGES ''' OK clicking on OK returns to facebook page but no chat opens. Some times |VERY RARLEY if as the page loades you click on chat button with 1/2 second of it appearing chat will open.