Please explain your problem in detail.

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We are currently aware of this bug. Please see '''[https://bugzilla.mozilla.org/show_bug.cgi?id=1304360 bug 1304360]''' for more information about the situation. This issue can currently be solved by '''[https://support.mozilla.org/en-US/kb/troubleshoot-extensions-themes-to-fix-problems#w_turn-off-hardware-acceleration disabling hardware acceleration on Firefox.]''' The developers need your help to solve this issue. If possible, can you please enter '''about:support''' in the Firefox address bar. This page contains information about your system and Firefox. Please click the '''Copy Text To''' '''Clipboard''' button, and paste the information into this thread. This will help the developers to discover the cause of the issue and create a potential patch. Thanks in advance for your assistance with this bug. Sorry for any inconvenience.