Firefox opens an empty window when macbook wakes from sleep.

''duplicate of https://support.mozilla.org/en-US/questions/1013678''
Firefox 31 is active and I close the Lid of my MacBook air. when opening the LID sometime (1 hour?) later an empty windowframe appears. The address-bar is unresponsive. The situation cures itself after a minute or so.
Closing Firefox and reopening it, helps immedeately

Hi hstoeri,
This has not happened to me before, but in the past I have seen threads that have narrowed it down to hardware acceleration.
Try disabling graphics hardware acceleration. Since this feature was added to Firefox, it has gradually improved, but there still are a few glitches.
You might need to restart Firefox in order for this to take effect, so save all work first (e.g., mail you are composing, online documents you're editing, etc.).
Then perform these steps:
#Open Firefox ''Options'' window (''Preferences'' on Mac or Linux) as follows:
#* In Firefox 29.0 and above, click the menu button [[Image:New Fx Menu]] and select ''Options'' for Windows or ''Preferences'' on Mac or Linux.
#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.
#Now, restart Firefox and see if the problems persist.
Additionally, please check for updates for your graphics driver by following the steps mentioned in the following Knowledge base articles:
* [[Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems]]
* [[Upgrade your graphics drivers to use hardware acceleration and WebGL]]
Did this fix your problems? Please report back to us!
Thank you.

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