Hello, Which anti-virus are you using for your computer? That particular issue is a tracking cookie, not dangerous but can be concerning for people worried about privacy issues: https://en.wikipedia.org/wiki/Tracking_cookie If you are having trouble with viruses I recommend you post a message in a forum specializing in virus/malware removal as they can provide step by step personalized instructions for whether your computer has a legitimate concern or how to use the tools to remove any malicious software: * Bleeping Computer Forums: http://www.bleepingcomputer.com/forums * Spyware Warrior Forums: http://www.spywarewarrior.com/index.php * SWI Forums: http://www.spywareinfoforum.com/ -------------- As for your screen going black - currently in version 33, Firefox has implemented a new, faster way of loading webpages. This new feature is called OMTC. However, there are still some tweaks Mozilla developers are making to this. There is a known issue that Mozilla works on very hard to fix: if you are experiencing black webpages on some sites, here's what you can do to avoid the problem in the meantime: Try starting Firefox in [[Troubleshoot Firefox issues using Safe Mode| Safe Mode]]. If the problem no longer happens in Safe Mode, please [/kb/upgrade-graphics-drivers-use-hardware-acceleration#w_turning-off-hardware-acceleration turn off hardware acceleration] and then restart Firefox normally. If you are having trouble opening those links due to the black screen on your browser: * If Firefox is open, click the menu button [[Image:New Fx Menu]], click Help [[Image:Help-29]] and select ''Restart with Add-ons Disabled''. * If Firefox is not running, you can start Firefox in Safe Mode on Windows: Hold the '''Shift''' key when you open the Firefox desktop or Start menu shortcut. * When the Firefox Safe Mode window appears, select "Start in Safe Mode". '''Do ''not'' select Reset Firefox'''.<br> [[Image:Safe Mode Fx 15 - Win]] * Click the menu button [[Image:New Fx Menu]] and select ''Options'' * In the Firefox Options (or Preferences) window, click the ''Advanced'' tab, then select ''General''. * In the settings list, you should find the ''Use hardware acceleration when available'' checkbox. Uncheck this checkbox. * Close Firefox, wait a few seconds, and then restart normally. Please let us know if this solves the problem. Engineering is also gathering more information about the issue would request that you fill out [http://www.surveygizmo.com/s3/1851506/1c87a6cf309a this survey]