What hardware acceleration does and why you might disable it
Hardware acceleration tells Firefox to use your graphics card instead of your processor for certain tasks — mainly displaying video and animations. This usually makes Firefox faster and smoother, especially on pages with lots of movement or video content.
You might want to turn it off if Firefox crashes on certain websites, if video playback stutters or shows strange colors, or if your system feels sluggish when hardware acceleration is on. Some older graphics cards or drivers don't work well with Firefox's acceleration settings, and disabling it can fix those problems. On very new systems, the opposite sometimes happens — you might need to turn it back on if Firefox feels slow.
Disabling hardware acceleration is a safe, reversible change. If it doesn't help, you can turn it back on in the same place.
Key Takeaways
- Hardware acceleration is on by default in Firefox and uses your graphics card to speed up video and animations.
- You turn it off through Firefox Settings under Performance, not through a browser extension or command line.
- Disabling it takes 30 seconds and requires no restart of Firefox or your computer.
- If disabling it doesn't solve your problem, you can turn it back on the same way.
How to disable hardware acceleration in Firefox
Open Firefox and click the menu button — three horizontal lines in the top right corner. Select Settings from the dropdown.
On the left side of the Settings page, click General. Scroll down until you see a section called Performance. You will see a checkbox that says "Use recommended performance settings." If that box is checked, uncheck it first — this unlocks the hardware acceleration option below it.
Below that checkbox, you will now see another checkbox labeled "Use hardware acceleration when available." Uncheck this box. Firefox will stop using your graphics card for those tasks when ready. You do not need to restart Firefox or your computer.
When to try disabling it first
If Firefox crashes when you visit a specific website or watch video on a particular platform, hardware acceleration is often the culprit. YouTube, Netflix, and Twitch sometimes trigger crashes on systems where the graphics driver is outdated or incompatible. Disabling acceleration is faster than updating drivers, and it tells you whether the driver is actually the problem.
If video playback shows wrong colors, freezes, or displays green or pink blocks, your graphics card may not be handling the video format correctly. Turning off hardware acceleration forces Firefox to use your processor instead, which almost always fixes color and display problems.
If your entire computer slows down when you have Firefox open — not just Firefox itself, but your whole system — hardware acceleration might be competing with other programs for graphics resources. This is less common but happens on systems with limited graphics memory or on laptops where the graphics chip is shared with system RAM.
What changes when you disable it
Firefox will use your processor instead of your graphics card for video playback and animations. On most modern computers, you will not notice any difference in speed. On older computers or those with weak processors, you might see slightly slower video playback or choppier animations, but the trade-off is usually worth it if the alternative is crashes or freezing.
Disabling hardware acceleration does not affect your internet speed, your ability to watch video, or any website's functionality. It only changes how Firefox renders what it displays on your screen.
How to turn it back on if you need to
If disabling hardware acceleration did not solve your problem, or if Firefox feels noticeably slower afterward, you can turn it back on. Go to Settings, click General, scroll to Performance, and check the "Use hardware acceleration when available" box again. The change takes effect when ready.
If you want Firefox to use the recommended settings automatically instead of managing this yourself, check the "Use recommended performance settings" box. Firefox will then decide whether to use hardware acceleration based on your system and graphics driver.
Troubleshooting if the problem persists
If disabling hardware acceleration did not fix crashes or video problems, the issue is likely something else. Check whether your graphics driver is current by visiting the website of your graphics card manufacturer — NVIDIA, AMD, or Intel, depending on what card you have. Outdated drivers cause many Firefox problems, and updating them sometimes fixes issues that disabling acceleration did not.
If you still see problems after updating your driver, try clearing Firefox's cache. Go to Settings, click Privacy & Security, scroll to Cookies and Site Data, and click "Clear Data." Make sure "Cached Web Content" is checked, then click Clear. This removes temporary files that sometimes cause playback or display problems.
If crashes happen only on one website, that website may have a bug in how it handles video or animations. Try the same video or animation in a different browser — Chrome, Safari, or Edge — to see whether the problem follows you or stays in Firefox. If it stays in Firefox, the problem is Firefox-specific and worth reporting to Mozilla's support forum.
Frequently Asked Questions
Does disabling hardware acceleration make Firefox slower?
On most computers, no. Modern processors handle video and animations well. On older computers with weak processors, you might see slightly slower video playback, but crashes or freezing usually go away. The trade-off is usually worth it.
Will disabling hardware acceleration affect other browsers?
No. This setting only changes Firefox. Chrome, Safari, Edge, and other browsers have their own hardware acceleration settings and are not affected by what you do in Firefox.
Do I need to restart Firefox after disabling hardware acceleration?
No. The change takes effect when ready. You do not need to close and reopen Firefox or restart your computer.
What if I can't find the Performance section in Settings?
Make sure you clicked General on the left side of the Settings page. Performance is always in the General section. If you see "Use recommended performance settings" at the top of the page, scroll down a bit — Performance is just below that.
Can I disable hardware acceleration for just one website?
No. Firefox's hardware acceleration setting applies to the entire browser. If you need to disable it for one site but keep it on for others, you would need to turn it on and off manually each time, which is not practical. If one website consistently causes problems, consider using a different browser for that site instead.