By mean of tried all steps that support forum tells little bit confusing ,so I am again writing may be the same steps : * Have you tried https://addons.mozilla.org/en-US/firefox/addon/noscript/ ? It blocks pages to run scripts automatically ? First block all scripts on a page and gradually allow them to run one by one ,watch if changes in behavior ? * I hope you have already ''Turn off Hardware acceleration'' ? Just check it one more time by tapping Menu > Options > Advance > General and Uncheck ''Use hardware acceleration when available''. Quit firefox and then restart it again. Note : Updating Graphics driver can also helpful in several cases. Read from here : https://support.mozilla.org/en-US/kb/firefox-hangs-or-not-responding#w_turn-off-hardware-acceleration