How to Block Porn on Firefox
To block porn on Firefox, use QuitPorn. It blocks porn in every browser and app on the device for 1 to 365 days, and nobody can switch it off or end it early, including you and our support team. The free built-in way is below, and it works until someone changes the setting back.
Firefox has no built-in porn filter. You have to add one from outside the browser.
How to Block Porn on Firefox for Free
- Turn on SafeSearch at google.com/safesearch, and set Bing and DuckDuckGo to strict in their settings.
- Set a family DNS on your computer, such as Cloudflare for Families. Our DNS guide shows how.
- Optionally add a blocking extension from Firefox Add-ons and give it a password.
What Firefox's Own Settings Can't Do
- Extensions can be removed from the Add-ons page in a few clicks.
- Network settings can be changed back by anyone who set them.
- Firefox is one browser. Every other browser on the computer stays open.
Free settings work until the moment you want them gone. That moment is usually late at night, and the person who set them up is the one deciding.
Block Porn on Firefox So It Stays Blocked
QuitPorn blocks porn in every browser and app, private windows included, on iPhone, iPad, Android, Windows and Mac. You choose the lock length, from 1 day up to 365 days, and nobody can end it early, including our support team. Add any site or app that leads you to porn to your own block list.
- One account, up to 5 devices.
- No password to find or type.
- It ends by itself on the date you chose.
Setup takes under 5 minutes on Android, Windows and Mac, and about 15 on iPhone. See plans.
Who This Is For
Anyone who wants porn gone from their own devices, especially if you have set up a filter before and switched it off. If you are protecting a child's device, use the free steps above with a passcode the child doesn't know.
Related Guides
Frequently Asked Questions
Does Firefox have a porn blocker?
No. Firefox has no built-in adult filter, so you need SafeSearch, a family DNS or a blocker that covers the whole computer.
Is there a Firefox extension that blocks porn?
Yes, several. Any extension can be removed from the Add-ons page, so it only works while you want it to.
What is the best way to block porn on Firefox?
QuitPorn. It blocks porn on every device you own and can't be switched off until your lock ends. See the best porn blockers of 2026.
Choose your lock length and set up in under 5 minutes (about 15 on iPhone).
This is general information, not medical advice. For help with your own situation, talk to a doctor or therapist.
The QuitPorn Team
