It achieves "efficiency" by dropping functionality and limiting rule counts. There are mitigations. Extensive discussion here: https://github.com/uBlockOrigin/uBlock-issues/issues/338
In uBlock-Origin – 1.52.0uBlockOrigin
uBlock-issues
Security & Privacy2018–2026
uBlockOrigin / uBlock-issues
uBlock-issues
This is the community-maintained issue tracker for uBlock Origin
93Distinct people
110Mentions
1Explicit recommenders
1.2KGitHub stars
What to know before exploring
What it is
This is the community-maintained issue tracker for uBlock Origin
GitHub
Where it is used
No documented product use was verified in the last source check.
What people are saying
I can't provide a source for Google axing a too-invasive extension, because they've never been straightforward about it. My favorite excuse was that the extension's description…
stonogo used a recommendation phrase. One indexed comment matches. This is a phrase match, not a verdict.
No classified warning is attached to this page. Read the discussions before treating silence as approval.
Also in these discussions
- gorhill/ublock · linked in 3 of the same discussions
Mentioned in the same Hacker News threads. That is not proof they are substitutes.
This week on Hacker News
Nov 8–Nov 15 UTC · Direct repository links and separately labeled related project stories. Indexed through 11/15/2026, 4:01:40 AM UTC.
No direct repository links were found in the indexed HN discussions over the past seven days. Older discussions are available below.
Mentions over time
HN mentions by year110 dated mentions
Observed mentions: 2018-10-25 03:16:40 UTC to 2026-09-15 09:50:47 UTC.
* An incomplete calendar period is marked with an outlined bar. Its count is not directly comparable with a full period.
Counts come from the repository’s dated source evidence. Index cutoff: 2026-11-02 08:16:59 UTC.
View mention counts and date ranges
| Period | Start (UTC) | End (exclusive, UTC) | Mentions | Submissions | Comments |
|---|---|---|---|---|---|
| 2018 | 2018-01-01 00:00:00 UTC | 2019-01-01 00:00:00 UTC | 1 | 1 | 0 |
| 2019 | 2019-01-01 00:00:00 UTC | 2020-01-01 00:00:00 UTC | 32 | 6 | 26 |
| 2020 | 2020-01-01 00:00:00 UTC | 2021-01-01 00:00:00 UTC | 18 | 2 | 16 |
| 2021 | 2021-01-01 00:00:00 UTC | 2022-01-01 00:00:00 UTC | 14 | 0 | 14 |
| 2022 | 2022-01-01 00:00:00 UTC | 2023-01-01 00:00:00 UTC | 25 | 4 | 21 |
| 2023 | 2023-01-01 00:00:00 UTC | 2024-01-01 00:00:00 UTC | 5 | 0 | 5 |
| 2024 | 2024-01-01 00:00:00 UTC | 2025-01-01 00:00:00 UTC | 7 | 1 | 6 |
| 2025 | 2025-01-01 00:00:00 UTC | 2026-01-01 00:00:00 UTC | 6 | 0 | 6 |
| 2026 (partial) | 2026-01-01 00:00:00 UTC | 2027-01-01 00:00:00 UTC | 2 | 0 | 2 |
From the project README
An excerpt from the repository, fetched Nov 13, 2026.
Read the project’s introduction
uBlock Origin (uBO) Issues
This repository is the official community-maintained issue tracker for uBO.
Support Forum
For support, questions, or help, visit /r/uBlockOrigin.
Filter List Issues
Report issues with filter lists or broken website functionality in the uAssets issue tracker.
uBO Lite (uBOL) Issues
Report issues specific to the Manifest Version 3 (MV3) variant in the uBOL issue tracker.
Localization issues
Language translations are handled at Crowdin: https://crowdin.com/project/ublock
Performance Issues
Speculated performance issues are marked as invalid and closed if they do not come with actual profiling data from the Firefox Profiler (or Firefox Profiler for Chromium) and a fully substantiated analysis supporting the claim.
WebRTC Issues
Do not open issues about WebRTC leaking local IP addresses. Supported modern browsers do not cause undue local IP address leaks through WebRTC. uBO is not a VPN/proxy tool. If you are experiencing such an issue, report it to the browser or VPN/proxy tools software provider or, if needed, both.
Filter List Requests
New filter list requests are not permitted and will be declined and closed.
uBO Development Builds
Use the development builds to help report issues and regressions before the next stable release.
Once you install a development build, it will automatically update when a new version is published.
Chromium: Click the most recent uBlock0_[version].chromium.crx file from the uBO Releases page.
Firefox: Click the most recent uBlock0_[version].firefox.signed.xpi file from the uBO Releases page.
Thunderbird: Download the most recent uBlock0_[version].thunderbird.xpi file from the uBO Releases page, then drag-n-drop it into Thunderbird's Add-ons Manager pane (Thunderbird 91+ required).
Read the full README on GitHubWhat Hacker News says
5 sourcesI rely mostly on the discussion around the implications for ublock origin when looking at manifest v3, because gorhill seems to be engaging with it in good faith.
Browsing the issue about it (https://github.com/uBlockOrigin/uBlock-issues/issues/338), it seems that manifest v3 blocks quite a lot of stuff out of the box. The fundamental issue seems to be that by mv3 prevents you from running arbitrary code to do filtering. This is concerning because it means that if sites / ad networks start coming up with ways to serve ads which can't be blocked by DeclarativeNetRequest (the issue lists a few), then ublock origin won't be able to block those ads. The way it's framed in the issue is "DNR is an obstacle to innovation."
There is currently a workaround in "ublock origin lite" (the mv3-compliant version) which lets you opt into regular ublock-o
Read the rest
rigin-style filtering on a per-site basis. Even if this workaround isn't removed, it still means ... opting in to full filtering on a per-site basis, and acknowledging a browser warning each time.
MV3 clearly puts control of how ad-blocking works back into the hands of the company who supplies the browser and makes its money by serving ads.
WebKit may be open source, but Safari is not. The interface to access Safari's content blocking settings and the platform on which Safari content blocking extensions are built are both closed source, so your FUD about "intercepting web traffic" would be more appropriately directed at Safari than at uBlock Origin.
Yes, I have personally downloaded the uBlock Origin source code. I have also reviewed the code and suggested improvements. However, I don't even need to download the code to realize the benefits of uBlock Origin being free and open source. Even if I hadn't downloaded the code, there are many other users and contributors who have reviewed the code, and you can confirm this by taking a simple look at the activity in the GitHub repos.
https://github.com/gorhill/uBlock
https://github.com/uBlockOrigin/uBlock-issues/issues
In Google and Mozilla are working on iOS browsers that aren't based on WebKitI bet people will crawl back to Firefox when all Chromium based browsers will have much worse ad blockers due to Manifest V3.
https://github.com/uBlockOrigin/uBlock-issues/issues/338
In Firefox lost ~16M users since last year> to use it but done freely without Google's complete control.
This will never happen. In fact, Google's intention is to sabotage every other browser, and shove ads everywhere.
https://github.com/uBlockOrigin/uBlock-issues/issues/338
In Firefox lost ~16M users since last year