Issue in Mozilla Firefox 38
Mozilla is currently working on a long-term fix, but if you are affected, you can take these steps to fix the issue yourself:
Turn off hardware acceleration
-  Click the menu button
 and choose .
 - Select the panel and the tab.
 - Uncheck Use hardware acceleration when available.
 - Click the menu button
 and then click Exit   
 - Start Firefox the way you normally do.
 
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