Who actually owns the software running inside your browser? You installed it. You chose it. You maybe even donated to the developer. And yet a company you don’t work for just decided it doesn’t get to run anymore.
That’s the story with uBlock Origin and Chrome. Google has removed Manifest V2 extensions from the Chrome Web Store, and uBlock Origin is among the casualties. BleepingComputer reported that Chrome began warning users the extension may soon be disabled. Tech Times reported the June 30 cutoff for dynamic filtering, with no workaround left. All About Cookies covered the closing of the last workaround people had been using. Android Authority put it plainly: Chrome users are losing their best ad blocker. And Cybernews noted that development continues on Firefox.
I write about AI agents for people who don’t build software, so you might wonder why I care about an ad blocker. Stay with me, because this one matters more than it looks.
Extensions Are Tiny Agents, and This Is How They Get Governed
When I explain AI agents to people, I usually start with something familiar. An agent is a piece of software you give a job to, and it goes off and does that job on your behalf without you supervising every step. That’s it. No robot, no science fiction.
By that definition, an ad blocker is an agent. A small, boring, extremely effective one. You gave it a standing instruction — block the junk — and it carried that out thousands of times a day on pages you never thought about. It made decisions on your behalf, at speed, in a place you couldn’t watch.
So what happened to uBlock Origin is a preview of a question that’s about to get very loud: when your agent and the platform it runs on disagree, who wins?
We now have a data point. The platform wins.
Why Capability Is the Whole Ballgame
The technical detail worth understanding is dynamic filtering. Under the older extension rules, an ad blocker could look at web traffic as it happened and make a call in the moment. Under the newer rules, extensions largely have to declare their filtering intentions in advance, from a pre-approved list, within limits the platform sets.
Think of the difference between hiring a bouncer who can read the room, and handing a doorman a printed guest list he isn’t allowed to deviate from. Both are doing security. Only one of them can react.
That distinction is going to repeat itself constantly as AI agents move into everyday tools. An agent that can observe and respond is genuinely useful. An agent restricted to pre-declared actions inside a sandbox someone else drew is a much smaller thing wearing the same name. When a company tells you the new version is safer and more predictable, they may be telling the truth — and also describing a product that can no longer do the job you wanted done.
What Non-Technical Readers Should Actually Take From This
A few things I’d write on a sticky note:
- Your agent’s power ceiling is set by its host, not its developer. uBlock Origin’s team didn’t get worse at their jobs. The permissions available to them changed.
- “It still works” and “it works the same” are different claims. Watch for this language whenever a tool you rely on gets updated for your protection.
- Platform incentives are not neutral. Google’s revenue comes substantially from advertising. That doesn’t prove bad faith, but you’re allowed to notice it when evaluating the explanation.
- Portability is real use over your tools. Cybernews noted development continues on Firefox. The users who can move are the ones with a choice.
The Question to Carry Forward
Over the next couple of years you’re going to be offered agents that book your travel, sort your inbox, negotiate your subscriptions, and shop on your behalf. Most will live inside someone else’s platform — a browser, an operating system, an app store, a social network.
Before you hand one a standing instruction, ask a simple question: if this agent’s job ever conflicts with the interests of the company hosting it, what happens? Not in theory. Structurally. Who has the ability to switch it off, and do they have a reason to?
uBlock Origin’s answer to that question is now a matter of public record. It’s a solid case study, and it cost its users nothing to learn from except an ad blocker.
Pick agents whose interests line up with yours, and hosts that can afford to let them work. That’s less of a technical skill than it sounds. It’s mostly just paying attention to who’s holding the switch.
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