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.
Add-on stats
Weekly download count: 206,768
Firefox on Android: Yes
Risk impact: Very high risk impact 
Risk likelihood:
Manifest version: 2
Permissions:
- alarms
- dns
- menus
- privacy
- storage
- tabs
- unlimitedStorage
- webNavigation
- webRequest
- webRequestBlocking See more
Size: 3.97M
URLs: Website ,Privacy policy
Ranking
# 1
Other platforms
Not available on Chrome
Not available on Android
Not available on Edge
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Add-on summary
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
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spammy, or outdated.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
- Effectively blocks unwanted ads
- Customizable settings for personal preferences
- Enhances browser usability and security
- Rarely detected by websites
- Exclusive high-quality performance for Firefox
Cons
Most mentioned
- Comprehensive ad and content blocking
- Customization options
- Unobtrusive and non-commercial nature
- Performance as a security requirement
User reviews
by mbo, 2025-01-22
by lxst, 2025-01-22
by Firefox user 15608062, 2025-01-22
Add-on safety
Risk impact
uBlock Origin requires a lot of sensitive permissions. Exercise caution before installing.
Risk likelihood
uBlock Origin has earned a fairly good reputation and likely can be trusted.
Upgrade to see risk analysis details