How to Enable Direct2D and DirectWrite Hardware Acceleration for Better Graphics Performance in Firefox

You can turn on Firefox’s built-in hardware acceleration and improve both graphical performance and the look of your fonts, With a few about:config tweaks, .
If you have a decent graphics card (DirectX 10-capable) and Windows 7 ), you can make graphics processing a bit more efficient with these tweaks:

1. Type about:config into your address bar and promise Firefox you’ll be careful.
2. Type render in the search box, and find the following two keys: gfx.font_rendering.directwrite.enabled
   mozilla.widget.render-mode
3. Double click on the gfx.font_rendering.directwrite.enabled entry so that it’s set to true.
4. Double-click on the mozilla.widget.render-mode entry and set the value to 6. If you can’t find this key, right-click anywhere in the window, hit to New > Integer, set it’s name to mozilla.widget.render-mode, and value to 6.
5. An then Restart Firefox

Now, you should notice that your fonts look a little bit nicer, and certain pages (like Google Maps) move a little bit smoother.
To revert back, just go back into
 about:config, disablegfx.font_rendering.directwrite.enabled, and set mozilla.widget.render-modeto -1.