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.
Add-on stats
Manifest V2
By: Raymond Hill
Rating: 4.80
63 new ratings
(19,802)
Weekly download count: 269,998
Firefox on Android: Yes
Permissions:
- alarms
- dns
- menus
- privacy
- storage
- tabs
- unlimitedStorage
- webNavigation
- webRequest
- webRequestBlocking See more
Size: 3.97M
URLs: Website ,Privacy policy
Full description: See detailed description
Ranking
# 1
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spammy, or outdated.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
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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- High ****** ********* ** * ****** ******** ******** ********** * ******* ******* *****
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- High *** ****** ******* ********* ***** ** ******** *** ********** **** ********
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.
- Low **** ********* *** ***** **** **** * ****** **** ***** ********** *** **** ****** ** ** ****** *** *****
- Low **** ********* *** **** **** ****** ******* ********** **** ****** ** ** ****** *** *****
- Good **** ********* *** **** **** *******
Upgrade to see full risk analysis details
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