AdBlocker Ultimate

AdBlocker Ultimate

Completely remove ALL ads. No “acceptable” ads or whitelisted advertisers allowed. This free extensions also helps block trackers and malware.

AdBlocker Ultimate promo image
What is AdBlocker Ultimate?

AdBlocker Ultimate is a very popular Firefox add-on by AdAvoid. This add-on has 2,015,468 daily active users and a good user rating of 4.78. The latest version, 3.7.21, was updated 9 days ago.

Stats date:
By: AdAvoid
Version: 3.7.21 (Last updated: 2023-01-25)
Creation date: 2016-02-18
Weekly download count: 91,448
Firefox on Android: Yes
Manifest version: 2
  • tabs
  • <all_urls>
  • webRequest
  • webRequestBlocking
  • webNavigation
  • storage
  • unlimitedStorage
  • contextMenus
Featured: Yes
Size: 6.16M
Email: Click to see
Risk impact: High risk impact
Risk likelihood: Very low risk likelihood
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AdBlocker Ultimate
AdBlocker Ultimate (v3.7.21)
47,266 1,029,132
AdBlocker Ultimate
AdBlocker Ultimate (v3.7.21)
2,742 465,149
AdBlocker Ultimate is designed with a singular purpose: remove all ads so you can focus your attention on the content you want.

- Remove all ads
- Helps block malware and tracking
- Improves browser performance by removing unwanted content
- No "acceptable" ads or whitelisted websites/ad networks

AdBlocker Ultimate is a free extension that blocks ads and malicious domains known to spread malware; it also disables sneaky tracking. We have extensive filters that filter against annoying display and video ads (including YouTube). 

Unlike other ad blockers, we do not have “acceptable ads” or an advertiser whitelist (i.e. certain advertisers pay to bypass ad filters). Blocking ads has the added benefit of speeding up browsing  because filtering out ads reduces CPU and memory usage. 

AdBlocker Ultimate allows you to easily accept ads from websites you choose, in cases where you want to give advertising credit to certain trusted websites. 

*** Types of ads we block ***
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Risk impact

AdBlocker Ultimate requires a number of risky permissions that can potentially harm your browser and steal your data. Exercise caution when installing this add-on. Review carefully before installing. We recommend that you only install AdBlocker Ultimate if you trust the publisher.

Risk impact measures the level of extra permissions an extension has access to. A low risk impact extension cannot do much harms, whereas a high risk impact extension can do a lot of damage like stealing your password, bypass your security settings, and access your personal data. High risk impact extensions are not necessarily malicious. However, if they do turn malicious, they can be very harmful.

Risk likelihood

AdBlocker Ultimate has earned a good reputation and can be trusted.

Risk likelihood measures the probability that a Firefox add-on may turn malicious. This is determined by the publisher and the Firefox add-on reputation on Firefox Browser Add-ons, the amount of time the Firefox add-on has been around, and other signals about the Firefox add-on. Our algorithms are not perfect, and are subject to change as we discover new ways to detect malicious extensions. We recommend that you always exercise caution when installing a Firefox add-on, especially ones with higher risk impact and/or higher risk likelihood.

Subscribe to the premium plan to see more risk analysis details
User reviews
I, as one, have always got along well with firefox, when I got my first computer, first thing I did was get a firefox browser for sure, never been sorry I did that either. Michael said that, bye for now my friends.

by cybercivizen, 2023-02-02

by Rodrigo, 2023-02-02
View all user reviews

The manifest file declares the requirements and permissions that a Firefox add-on will have access to. By reviewing the manifest, you may be able to determine if a Firefox add-on is over-reaching (for example, if an extension is overriding your new tab page, or search provider, or requesting access to your web activities without any good reason).

  "manifest_version": 2,
  "name": "__MSG_name__",
  "short_name": "__MSG_short_name__",
  "author": "AdAvoid Ltd",
  "version": "3.7.21",
  "applications": {
    "gecko": {
      "id": "",
      "strict_min_version": "57.0"
  "default_locale": "en",
  "description": "__MSG_description__",
  "icons": {