An ad blocker for Firefox is an add-on from Mozilla Add-ons that stops ads, trackers or both from loading on the pages you visit. You only need one. Some block everything, some let unobtrusive ads through by default, and some focus on trackers or a single site. Ten follow in no particular order.
Firefox gives you plenty of ad blockers to choose from, and they don't all block the same things. Some go after every ad, some leave quieter ads alone unless you change a setting, and some care more about trackers than ads.
Every detail below comes from each add-on's Mozilla Add-ons listing as of Oct 2026: users, rating, how many ratings, last updated date and publisher. If you'd like the bigger picture on staying private online, my guide to privacy strategies for your business covers more than the browser.
How these Firefox blockers were chosen and how they line up
I worked from what each listing shows, not from my own speed runs: the number of users, the rating, the number of ratings, the last updated date and whether Mozilla's recommended badge appears. The free plan column says Yes only where the listing text mentions free use. Not stated means it didn't say.
| Tool | Type | Good for | Free plan |
|---|---|---|---|
| AdBlock for Firefox | Ad blocker | The same blocker across Chrome, Safari and Firefox | Not stated |
| Adblock Plus | Ad blocker | Blocking ads, unobtrusive ones allowed by default | Yes |
| AdBlocker for YouTube | Single site blocker | YouTube ads only | Not stated |
| AdBlocker Ultimate | Ad blocker | Every ad, no acceptable ads list | Yes |
| AdGuard AdBlocker | Ad blocker | Ads and pop ups on busy sites | Yes |
| Disconnect | Tracker blocker | Hidden trackers across many site types | Not stated |
| Ghostery | Privacy and ad blocker | Trackers and ads together | Yes |
| Malwarebytes Browser Guard | Security and ad blocker | Phishing, malicious content, ads and trackers | Not stated |
| Privacy Badger | Tracker blocker | Companies tracking you across sites | Not stated |
| uBlock Origin | Content blocker | Wide spectrum blocking, light on memory | Yes |
Ten ad and tracker blockers on Mozilla Add-ons
AdBlock for Firefox
Best for: Anyone who already uses this blocker in Chrome or Safari and wants the same one in Firefox, with 1,388,349 users as of Oct 2026.
Adblock Plus
Best for: People happy to let unobtrusive ads through by default to support sites, a setting its listing says you can change.
AdBlocker for YouTube
Best for: Removing ads on YouTube only, with a 3.8 rating from 1,377 ratings, the lowest rating on this page as of Oct 2026.
AdBlocker Ultimate
Best for: Blocking every ad with no acceptable ads list or whitelisted advertisers, plus trackers and malware, as its listing describes.
AdGuard AdBlocker
Best for: Ads and pop ups on Facebook, YouTube and other sites, from Adguard Software Ltd, with Mozilla's recommended badge on its listing.
Disconnect
Best for: Hidden trackers across advertising, analytics and social sites, though the listing shows a last update of Feb 22, 2024.
Ghostery
Best for: Trackers and ads together, including on YouTube and Facebook, from the publisher of the same name, last updated Oct 28, 2026.
Malwarebytes Browser Guard
Best for: Phishing and malicious content as well as ads and trackers, from the publisher Malwarebytes, rated 4.1 as of Oct 2026.
Privacy Badger
Best for: Blocking the companies that track you rather than ads as such, from the nonprofit EFF, with a 4.8 rating as of Oct 2026.
uBlock Origin
Best for: A wide spectrum content blocker with 11,365,567 users as of Oct 2026, the most of any listing here, from developer Raymond Hill.
Ads, trackers or YouTube: choosing a blocker type
- You want every ad gone: a blocker whose listing says it allows no acceptable ads.
- You don't mind quiet ads that help sites: a blocker with an acceptable ads setting switched on by default.
- Being followed matters more than ads: a tracker blocker.
- You worry about scam pages: a blocker that also lists phishing and malicious content.
- Only YouTube bothers you: a single site blocker, though several general blockers here name YouTube on their listings too.
Busy review counts against quiet ones
Here's a detail that's easy to miss. AdBlocker Ultimate shows 27,259 ratings on 1,055,599 users, while Privacy Badger shows 3,161 ratings on 1,905,661 users, as of Oct 2026. The add-on with fewer users has far more people rating it.
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That doesn't make one better than the other. It means the stars on a busy listing rest on more voices, so they're harder to move. On a quiet listing, a handful of new reviews can shift the rating quickly, so read the newest ones before you decide.
Edge users have their own set of blockers, which we compare in ad blocker add-ons for Edge.
One blocker, not three
Running two or three blockers at once doesn't add up to more protection. It mostly adds settings to manage and more things to switch off when a site stops loading. Choose one general blocker, and only add a tracker blocker if it does a job your first one doesn't.
If you do add a second, make it a different kind: a tracker blocker alongside an ad blocker, never two ad blockers doing the same job. And whichever you keep, give it a few days before you judge it, because the first visit to a busy site is rarely the whole picture.
Do you make ad blockers for Firefox? Tool makers can ask to be considered for a featured place on this list.
My plain advice on running a blocker in Firefox
Choose one blocker that matches how strict you want to be, install it from Mozilla Add-ons and leave the defaults alone for a week. If a site you rely on stops working, pause the blocker for that site rather than uninstalling it. That way you keep the protection everywhere else.
If you're weighing up a browser that blocks ads for you, my look at whether Brave is safe is a good read first.
Want your tool on this list? Featured spots and reviews here are paid partnerships. Here's how to partner with me.
Frequently asked questions
What's the best ad blocker for Firefox?
There isn't one answer: it depends on whether you want every ad gone, quieter ads allowed or trackers stopped. Choose the type first, then one add-on of that type.
Are Firefox ad blockers free?
Several listings here mention free use in their own text, and the rest don't say. The free plan column shows which, as of Oct 2026.
Can I run two ad blockers in Firefox?
You can, but it rarely helps. One general blocker plus, at most, one tracker blocker is plenty for most people.
Does an ad blocker stop YouTube ads in Firefox?
Several listings here say they block ads on YouTube, and one add-on is built only for YouTube. Sites change often, so check the newest reviews.
What does acceptable ads mean?
It's a setting some blockers switch on by default that lets unobtrusive ads through to help support websites. The listing says when it's on, and you can usually turn it off.
