Firefox v31.0 unstable in Trusty Tahr

Recently upgraded to v14.04 to evade Firefox instability problems. It didn't work. FF causes crashes frequently and it can't be traced to a particular extension/plugin as yet. The system error box sometimes says the problem was 'Xorg', sometimes 'compiz' and the text left onscreen often says something about the kernel not syncing and 'returning to text mode'. My computer is an HP Pavillion Notebook Dv4(32 bit) with a dual core 2.2Mhz AMD and 4 M ram. Both the Bios system diagnostics and the grub routine says the hardrive and memory are fine.The O/S (Ubuntu 14.04) otherwise seems fine when using other programs. This computer ran FF with Ubuntu 12.04 just fine but starting with 13.04 the FF crashes began and reinstalling 13.04, then 13.10 then 14.04 hasn't cured the issue. It hasn't yet happened on Chromium. The problem is more likely in the presence of video or quick image input from the internet but not from playbacks on the hard-drive. I have the latest shockwave and flash available for Linux as well as a VLC plugin. The temperature monitor on the machine shows no sign of thermal overload. I am wondering whether there have been too many recent updates for FF in the name of security and that Chromium, albeit less secure, may be the only viable browser to use for Ubuntu. Hmmmm...