I had multiple times in bugs to ask users to disable the HWA to test if this would fix the issue. Now we have to guide the users to use the about:config editor and change 'layers.acceleration.disabled' and additionally on Windows 'gfx.direct2d.disabled'. It would be easier to guide the users with "uncheck the hardware acceleration on Prefs/Advanced/General". Firefox/Seamonkey have this option already at this position.

Comment on attachment 8541929 [details] [diff] [review] addHWA.patch Review of attachment 8541929 [details] [diff] [review]: ----------------------------------------------------------------- Hmm, if it really does something only for windows, why it is shown (and enabled) for other OSs?

On all platforms it changes 'layers.acceleration.disabled' directly in XUL <preference> and on Windows additionally 'gfx.direct2d.disabled' through JS.

Comment on attachment 8541929 [details] [diff] [review] addHWA.patch Review of attachment 8541929 [details] [diff] [review]: ----------------------------------------------------------------- Ah, ok! r=mkmelin