Ad Blocking in Chrome 134: What Actually Works After Manifest V3

Choosing an ad blocker for Chrome in 2026 is more complicated than it used to be. Google's Manifest V3 migration changed how ad blockers work, limiting filter rules and replacing the request interception model they depended on. Some blockers adapted well. Others did not. Full disclosure: I built these tools as part of Zovo, a collection of Chrome extensions I maintain at zovo.one. Take my perspective accordingly. I have tested every major ad blocker on Chrome 134. Here is what works, what changed, and how to set things up. What MV3 Changed The old way: the webRequest API let extensions intercept and block any network request before it hit the network stack. uBlock Origin's MV2 version applied 300,000+ filter rules with minimal overhead because filtering ran in a persistent background page. The new way: declarativeNetRequest (DNR) requires extensions to declare blocking rules upfront. Chrome's network stack applies them internally. The limits: 330,000 static rules per extension (shared