uBlock Origin's team says it will no longer chase Facebook's constantly-changing ad-detection code.
If ads have started slipping past uBlock Origin on Facebook after years of a clean, ad-free feed, it isn't a bug on your end. The small volunteer team behind the ad blocker has decided to stop playing what one member called an exhausting game of whack-a-mole with Facebook specifically, after years of the platform tweaking its code to slip ads past uBO's filters.
What actually changed: uBlock Origin isn't ripping out its existing Facebook ad filters, but its developers say they will no longer keep updating them every time Facebook finds a new way around them. If Facebook patches around a current filter, that filter will likely stay broken going forward.
Where This Came From
The news surfaced on the uBlock Origin subreddit, where a member of the small development team explained the decision directly, describing Facebook as a "disgusting anti-user site" whose developers spend time watching open-source ad-blocking projects like uBO and quietly changing their code to get ads past them.
Why Facebook Was Especially Hard to Keep Blocking
According to the team's own explanation, Facebook doesn't just rotate ad markup occasionally it hides the word "Ad" by splitting it across unrelated bits of code and stuffing in junk text that's invisible to a person reading the page but still trips up filter logic looking for that pattern. On top of that, the labels used to identify ads reportedly change on their own on a rolling basis, with one team member describing it as Facebook randomizing the order and previously adding fake letters to throw filters off entirely.
The team was blunt about why they're stepping back: it's a resourcing problem. uBlock Origin's actual development team is a small handful of volunteers maintaining a tool used by tens of millions of people, and constantly re-engineering filters for one platform's evasion tactics wasn't sustainable against a company with entire teams dedicated to the opposite problem.
This is a separate issue from Manifest V3: uBlock Origin stepping back from Facebook-specific filters has nothing to do with the broader shift happening on Chrome and Edge, where both browsers are ending support for the Manifest V2 extension framework that full uBlock Origin depends on. That's a platform-level change; this is uBlock Origin choosing not to keep chasing one site's evasion tactics.
What This Means If You Use uBlock Origin
Nothing changes immediately existing Facebook ad filters are still in place and still working today. What's different going forward is that when Facebook finds a way around one of those filters, as some users have already begun reporting on Reddit, uBlock Origin's core team won't be racing to patch it. The project's maintainers have said anyone who wants to keep fighting that specific battle is welcome to submit their own filter fixes as pull requests; the team just isn't committing to do it themselves anymore.
It's also not unique to uBlock Origin. Brave has been fighting a similar losing battle trying to keep ads out of YouTube, another case of a platform with dedicated resources for defeating ad-blocking logic outpacing a much smaller team trying to keep up.
Sources
- PiunikaWeb's report on uBlock Origin's decision: PiunikaWeb
- The original uBlock Origin subreddit thread: r/uBlockOrigin
- User reports of Facebook ads returning: r/uBlockOrigin
This article was written by DigitalEscapeTools based on the uBlock Origin team's own public statements and published reporting available at the time of publication.
