1. Open Mozilla Firefox.
2. Click the 3-bar menu button (≡) in the top right corner.
3. Click Options.


4. Scroll down the General page and look for the Performance section.


5. Uncheck ‘Use recommended performance settings.’ Additional settings will be displayed.



6. Tick the checkbox beside 'Use hardware acceleration when available' if you want to activate hardware acceleration.

-OR-

Uncheck 'Use hardware acceleration when available' if you want to turn off hardware acceleration.


7. Restart Mozilla Firefox after you have made the desired changes.