Hello, I've seen this problem listed several times prior to this post, but none of the solutions have helped me. I've been using Firefox for ages and the last 3 updates or so have been exhibiting this issue. When I attempt to load a website, Firefox will begin to take me to the page and then hang. The circle in the tab will stop moving and it will sit there until I move the mouse or press a button on the keyboard. As long as the mouse is continuously moving or keyboard buttons are pressed, the page will load fine. The same thing happens with YouTube. The video will start and then freeze unless the mouse/keyboard is moved. Firefox also exhibits this behavior when I try to download a file from a website. The download will start and then hang until I move the mouse or press a button, then it will continue for a few seconds and hang again until I repeat the mouse movement or keyboard button press. So far, I've tried updating Firefox, Java and Flash; starting Firefox in Safe Mode; uninstalling and reinstalling Firefox: doing a complete uninstall and reinstall of Firefox with profile removal and creation. I've run the following ad and malware detection tools with no infections found: Malwarebytes' Anti-Malware, AdwCleaner, SuperAntispyware, Microsoft Safety Scanner, Windows Defender, Spybot Search & Destroy, Kasperky Free Security Scan and Anti-rootkit utility TDSSKiller. The only thing that I've tried that "seemed" to work was starting Windows in Safe Mode with networking and running Firefox there. I was able to watch YouTube videos without freezing and websites appeared to load properly. Obviously, I can't run in Safe Mode all the time. I've attached a screenshot of what it looks like when Firefox hangs on Google News. Notice that the images partly load, but a good number of them are either waiting or not loaded. I hope someone can help me, since I really like Firefox and I'd hate to switch to Chrome or (shudder) IE. Thanks in advance for your help!