I have tried re-installing Firefox as well but to no use.

Start Firefox in [[Safe Mode]] to check if one of your add-ons is causing your problem (switch to the DEFAULT theme: Tools > Add-ons > Themes). See [[Troubleshooting extensions and themes]] and [[Troubleshooting plugins]] If it does work in Safe-mode then disable all your extensions and then try to find which is causing it by enabling one at a time until the problem reappears. You can use "Disable all add-ons" on the [[Safe mode]] start window to disable all extensions. You have to close and restart Firefox after each change via "File > Exit" (Mac: "Firefox > Quit"; Linux: "File > Quit") .......... * If you use extensions like ''Adblock Plus'' or ''NoScript'' or ''Flashblock'' that can block content then make sure that such extensions aren't blocking content. You can see the installed Firefox extensions in "Tools > Add-ons > Extensions". See also [[Images or animations do not show]] and http://kb.mozillazine.org/Images_or_animations_do_not_load