Hello, Thank you for your question. 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: Other users with this problem had an embedded intel hd graphics card with an old driver present. Please select the appropriate driver below: Intel HD 2000/3000: 32bit https://downloadcenter.intel.com/Detail_Desc.aspx?DwnldID=23763 64bit https://downloadcenter.intel.com/Detail_Desc.aspx?DwnldID=23764 Intel HD 4000: 32bit https://downloadcenter.intel.com/Detail_Desc.aspx?DwnldID=24328 64bit https://downloadcenter.intel.com/Detail_Desc.aspx?DwnldID=24329 If updating your driver doesn't work, or is not applicable to you, 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. 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] Thank you!