uBlock Origin development build

Finally, an efficient blocker. Easy on CPU and memory.

uBlock Origin Development Build is the official precursor to the stable uBlock Origin extension, designed for users who want to test the newest fixes and improvements before official release. Unlike traditional ad blockers, uBlock Origin is a wide-spectrum blocker that efficiently blocks not only ads but also trackers and malware sites using well-known filter lists such as EasyList, EasyPrivacy, and Peter Lowe’s servers.

This development build operates independently from the stable release, allowing for testing without affecting your current settings. It is optimized for minimal CPU and memory usage, ensuring smooth web browsing. Users are encouraged to report any issues via the official GitHub issue tracker to contribute to ongoing improvements.

By:: Raymond Hill (gorhill)
Users:: 100,000+
Rating:: 4.80

(135)
Version:: 1.63.3.17 (Last updated: 2025-04-24)
Creation date:: 2024-03-27
Risk:: Very high risk impact Moderate risk likelihood
Permissions:: alarms
contextMenus
privacy
storage
tabs
unlimitedStorage
webNavigation
webRequest
webRequestBlocking
<all_urls>
Size:: 4.10M
Email:: ub*****@raymondhill.net
URLs:: Privacy policy
Full description:: See detailed description
Source:: Chrome Web Store
Updated:: 17 hours ago

Ranking

# 1,886 ▲ 62

User reviews

Users praise uBlock Origin development build as a lightweight, highly effective ad blocker that works better than stable versions, especially on YouTube. It's appreciated for continual updates and long-term reliability. However, many express concerns about the extension's potential removal from the Chrome Web Store and difficulties with auto-updating. Some mention limitations in element-blocking granularity and worry over Google's attitude towards such extensions. Overall, it remains a favorite among users wanting strong ad blocking on Chrome despite these issues.

Pros

Highly effective ad blocker, especially on YouTube and various websites.
Lightweight and efficient compared to other ad blockers or stable versions.
Works well even on browsers where other versions fail, with better performance.
Actively updated in the development build, providing better and constant improvements.
Trusted and used by many users over several years across multiple devices.

Cons

The extension does not auto-update easily and may require manual updates.
There's concern or reports about the extension being removed from the Chrome Web Store.
Some users have difficulty with element blocking features compared to other versions (e.g., can't select specific small elements).
Fear and frustration about possible future removal or lack of support from Google/Chrome.
Certain functional limitations or missing features compared to other variants like Ublock Origin Lite.

Recent reviews

It's awesome! Great workaround. I hope the developer keeps updating this Chrome extension. I'm not a fan of Firefox. As another poster suggested, it comes pre-installed with Thorium Chrome browser. But I find the extension won't auto-update. It needs to be manually (forcibly updated) despite the settings.

Google User (M. B.), 2025-04-12

Comes preinstalled with Thorium Browser.

Google User, 2025-04-05

Jeśli przestanie działać w Vivaldi to przechodzę (z żalem) na Firefox.

Artur, 2025-03-15

View all user reviews

Extension safety

Risk impact

uBlock Origin development build 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.
Critical ****** ****** ** *** ********* ****** * *********** ******** **** ** ** *** ******* *** ****** **** **** *** ******* *****
High ****** *** ********* ** ******* *** ******* ******* ** ****** *** *** ******** ******
High ****** ********* ** * ****** ******** ******** ********** * ******* ******* *****
High ******* ******* **** *** ****** ***** *** ***** ** ******* **** ********* ********* ** * *********** *****
High *** ****** ******* ********* ***** ** ******** *** ********** **** ********

Risk likelihood

uBlock Origin development build is probably trust-worthy. Prefer other publishers if available. Exercise caution when installing this extension.

Risk likelihood analysis details

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

Upgrade to see full risk analysis details

Instantly check and monitor your browser extensions' risks and permissions with Extension Guard.