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In the settings list, you should find the Use hardware acceleration when available checkbox.In the Firefox Options (or Preferences) window, click the Advanced tab, then select General.In Firefox 28.0 and previous versions, click the orange Firefox button at the top left, then select the "Options" button, or, if there is no Firefox button at the top, go to Tools > Options.In Firefox 29.0 and above, click the menu button and select Options for Windows or Preferences on Mac or Linux.Open Firefox Options window ( Preferences on Mac or Linux) as follows:.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.).

Since this feature was added to Firefox, it has gradually improved, but there still are a few glitches. Try disabling graphics hardware acceleration.
