Before any steps, let’s check if GPU acceleration is already on.
- Open about:support in Firefox.
- Navigate to Graphics section.
- Check the GPU Accelerated Windows field.
2/2 or whatever, anyway, the first number must be greater than 0, then Firefox is already hardware accelerated. And you don’t need to take following procedures to force-enable it. Otherwise, let’s do a few modifications to force-enable the GPU acceleration in Firefox!