Hi tony9, Yahoo seems to be heavy on the resources. I just went there and it started two new processes and is using an additional 300+ Mb of memory, but, my computer didn't freeze. Take a closer look at your Performance settings in Options on the General Page. And refer to this article for some ideas: [https://support.mozilla.org/en-US/kb/performance-settings?as=u&utm_source=inproduct Firefox's performance settings] Firefox also has it's own Task Manager which can help identify resource usage: Menu -> More -> Task Manager

Many site issues can be caused by corrupt cookies or cache. '''Warning ! ! ''' This will log you out of sites you're logged in to. You may also lose any settings for that website. * [https://support.mozilla.org/en-US/kb/delete-cookies-remove-info-websites-stored Delete cookies to remove the information websites have stored on your computer] {web link} * [https://support.mozilla.org/en-US/kb/how-clear-firefox-cache How to clear the Firefox cache] {web link} If there is still a problem, '''[https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-using-safe-mode Start Firefox in Safe Mode]''' {web link} by holding down the '''<Shift> ''(Mac=Options)''''' key, and then starting Firefox. A small dialog should appear. Click '''Start In Safe Mode''' (not Refresh). Did this help? While you are in safe mode; Try disabling graphics hardware acceleration in Firefox. Since this feature was added to Firefox it has gradually improved but there are still a few glitches. ''[https://support.mozilla.org/en-US/kb/forum-response-disable-hardware-acceleration How to disable Hardware Acceleration]'' {web link}