uBlock Origin

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

uBlock Origin - Wide-spectrum Content Blocker Add-on for Firefox

uBlock Origin is a high-performance, wide-spectrum Firefox add-on. Beyond being just an 'ad blocker', it excels in blocking a wide array of content, including ads, trackers, coin miners and popups instantly. Pre-configured with several filter lists like EasyList (for ads) and EasyPrivacy (tracking), it offers immense customization to the users. The add-on is a unique blend of CPU and memory efficiency, aiming to deliver a seamless browsing experience.

Download

View on Firefox Browser Add-ons

Add-on stats

By: Raymond Hill

Daily users: 9,642,597

126.72K

Rating: 4.80

(19,802)

63 new ratings

Version: 1.62.0 (Last updated: 2025-03-16)

Version code: 5868389

Creation date: 2015-04-25

Weekly download count: 269,998

Firefox on Android: Yes

Risk:

Permissions:

alarms
dns
menus
privacy
storage
tabs
unlimitedStorage
webNavigation
webRequest
webRequestBlocking

Size: 3.97M

URLs: Website ,Privacy policy

Full description: See detailed description

Ranking

# 1

Other rankings

#1 in Privacy & Security

#1 in block ads keyword 96

#1 in blog keyword 3

#1 in memory keyword 13

#1 in mock keyword 15

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Other platforms

Not available on Chrome

Not available on Android

Not available on Edge

User reviews

These summaries are automatically generated weekly using AI based on recent user reviews. Firefox Browser Add-ons does not verify user reviews, so some user reviews may be inaccurate, spammy, or outdated.

Pros

Works effectively as an adblocker
Essential for every Firefox installation
Fast and simple to use
Updates and workarounds are efficient

Cons

Installation issues leading to 'corrupt' add-on messages
Add-on disappearing or being disabled unexpectedly
Limited support in certain environments (like Chrome)

Most mentioned

Installation issues with Firefox stating add-on is corrupt
Disabling of popular add-ons by Firefox
Overall effectiveness as an adblocker

User reviews

by Alexa, 2025-03-17

by Tomasm21, 2025-03-17

by fracturedprism, 2025-03-17

View all user reviews

Add-on safety

Risk impact

uBlock Origin requires a lot of sensitive permissions. Exercise caution before installing.

Risk impact analysis details

Critical Grants access to browser tabs, which can be used to track user browsing habits and history, presenting a privacy concern.
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Risk likelihood

uBlock Origin has earned a fairly good reputation and likely can be trusted.

Risk likelihood analysis details

High This extension was recently updated in the past month. New updates may not be stable or safe.
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