Why BlockIs another blocker extension breaking a site?
Ad blockers and privacy extensions all work in a similar way: filter lists decide what to cancel. The browser only says a request was “blocked by an extension”, not which one, so with two or three installed it’s easy to blame the wrong one.
Updated November 2026. Menus move around between versions: if a label is a little different, look for the closest match.
Quick test: one at a time
- Open the extension’s toolbar popup and look for a per-site switch. It’s usually called something like Pause on this site, Trust site, Protections are on for this site or Block ads on this website.
- Turn it off for this site and reload.
- Still broken? Turn it back on and try the next extension. Testing them one at a time is the only way to know which one did it.
Find what it blocked
- Many blockers have a log of what they did: AdGuard’s browser extension calls it the filtering log, and several others list blocked trackers right in the popup.
- Look for the domain behind the broken feature: a video host, CAPTCHA, payment provider, comments service, or one of the site’s own subdomains.
- Allow that domain or element only, using the extension’s allowlist or custom rules, instead of trusting the whole site.
Good to know
- Running several blockers mostly duplicates work. If two block the same domain, the site stays broken until you allow it in both.
- Security extensions (such as Malwarebytes Browser Guard) can block whole sites as risky, with a warning page. Only continue if you’re sure the site is safe.
- If no extension makes a difference, check your browser’s own protection and your DNS or network.