uBlock Origin

uBlock Origin

Finally, an efficient wide-spectrum content blocker. Easy on CPU and memory.

uBlock Origin promo image
What is uBlock Origin?

uBlock Origin is a very popular Firefox add-on by Raymond Hill. This add-on has 6,363,930 daily active users and a good user rating of 4.78. The latest version, 1.46.0, was updated 2 days ago.

Stats date:
Version: 1.46.0 (Last updated: 2023-02-01)
Creation date: 2015-04-25
Weekly download count: 150,828
Firefox on Android: Yes
Manifest version: 2
  • dns
  • menus
  • privacy
  • storage
  • tabs
  • unlimitedStorage
  • webNavigation
  • webRequest
  • webRequestBlocking
  • <all_urls>
Featured: Yes
Size: 3.22M
Risk impact: Very high risk impact
Risk likelihood: Very low risk likelihood
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Other platforms

uBlock Origin
uBlock Origin (v1.46.0)
26,108 10,000,000
uBlock Origin
uBlock Origin (v1.46.0)
1,543 8,085,404
uBlock Origin is not an "ad blocker", it's a wide-spectrum content blocker with CPU and memory efficiency as a primary feature.


Out of the box, uBO blocks ads, trackers, coin miners, popups, etc. through the following lists of filters, enabled by default:

- EasyList (ads)
- EasyPrivacy (tracking)
- Peter Lowe’s Ad server list (ads and tracking)
- Online Malicious URL Blocklist
- uBO's own lists

More lists are available for you to select if you wish:

- EasyList Cookie
See more
Risk impact

uBlock Origin requires a lot of risky permissions and is not safe to use. Avoid installing this add-on unless you absolutely trust this 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

uBlock Origin 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.

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User reviews
by Tardigrade, 2023-02-02

best adblocker, hope it manages to stay ahead of twitch ads again
by shampain, 2023-02-01

by uma, 2023-02-01
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).

  "author": "Raymond Hill & contributors",
  "background": {
    "page": "background.html"
  "browser_action": {
    "browser_style": false,
    "default_icon": {
      "16": "img/icon_16.png",
      "32": "img/icon_32.png"
    "default_popup": "popup-fenix.html",
    "default_title": "uBlock Origin"
  "browser_specific_settings": {