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If an ad blocker seems broken in Chrome, first identify what you mean: a third-party ad-blocking extension, or Chrome’s own Intrusive ads control. The built-in control limits ads on sites with poor ad experiences; it is not a general-purpose replacement for an extension. The checks below focus on desktop Chrome, because Chrome extensions are not available in Chrome on phones.
First, identify which ad-blocking feature is failing
If Chrome displays an “Intrusive ads blocked” notice, check Chrome’s built-in setting. If a named extension such as an ad blocker is letting ads through, check that extension’s status and access to the affected site. These features have separate controls and need different fixes.
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Chrome’s built-in control targets ads on sites with poor ad experiences, such as excessive ads, flashing graphics, autoplaying audio, or ad walls. It does not filter ads generally. You can change the setting for all sites or allow ads on an individual trusted site. See Google’s instructions for visiting a site by turning off Chrome’s ad blocker.
Check the extension is enabled and allowed on the site
- In desktop Chrome, select More (the three-dot menu) > Extensions > Manage extensions.
- Find the ad-blocking extension and make sure its switch is on.
- Select Details. Review the site access setting. Depending on the options available, allow access on all sites or add the affected site under On specific sites. If access is limited to On select, verify that the site is included.
- If Chrome says the extension is corrupted, select Repair if that option appears.
An extension can be enabled yet still fail on one site if it does not have permission to run there. Google’s extension management instructions cover these settings.
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Check whether the browsing context or device is supported
Incognito windows
Installed extensions do not necessarily run in Incognito. To allow one there, open its Details page from More > Extensions > Manage extensions, then turn on Allow in incognito. Enable this only if you want that extension active in Incognito. Guest and Incognito mode cannot be used to install extensions; install an extension from a regular Chrome profile first.
Phones and tablets
The desktop extension steps do not apply to Chrome on a phone or tablet. Chrome Web Store help says extensions are for computers, not mobile devices, even if the browser is switched to desktop mode. For extension-specific compatibility or troubleshooting, see Google Chrome Web Store Help.
Find out whether work or school policy is blocking it
An organization can restrict which extensions may be installed or used. If Chrome is managed by your workplace or school and the extension is blocked, contact the administrator. Do not try to bypass a managed policy. Google describes these restrictions in its extension management help and Chrome Web Store troubleshooting help.
Look for unwanted software if Chrome is redirecting or showing persistent pop-ups
Ads getting past a blocker are different from unfamiliar toolbars, repeated redirects, extensions that return after removal, or pop-ups that keep appearing. Those symptoms can point to unwanted software affecting the browser. Google recommends checking the computer for unwanted programs before resetting Chrome settings. If you reset Chrome, some extensions may need to be turned on again; re-enable only extensions you trust. Follow Google’s guidance on removing unwanted ads, pop-ups, and malware.
Use cookie changes only for a specific site problem
Clearing cookies is not identified in Google’s help as a first-line fix for a malfunctioning ad blocker. Deleting them can sign you out of sites and erase saved preferences. Blocking third-party cookies can also make some sites behave unexpectedly. Avoid a broad cookie clear unless you have a separate reason to do it; Google explains the effects in its Chrome cookie settings help.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.If the extension still does not work
If Chrome’s Repair option did not resolve an extension problem, Google points users to the Chrome Help Forum. For an issue limited to a particular extension, use the developer’s support form; Google’s Chrome Web Store help directs users to the extension developer for product-specific assistance.
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