System AMD8350 , 16Gb mem, Sabertooth mb, radeon 7800 Vid card. Ubuntu 16.04 LTS Mozilla Firefox version that came in Ubuntu 16.04. It appears that I can go to any other website so far with no problem, but ' investmentwatchblog.com' will cause a lock up about eight out of ten times, often interfering with my mouse and keyboard operation. When that happens the only choice that I am aware of is to punch the button for a forced reboot of the system. This occured so frequently in the previous Ubuntu 14.04LTS that I finally loaded an app that allowed me block accesss to that website. Why does Mozilla Firefox have that bad of a problem with that website? The only add ons installed is a youtube video downloader, and shockwave flash.