Why BlockIs uBlock Origin breaking a site?
uBlock Origin blocks ads, trackers and malware domains using filter lists. Lists are written to avoid breaking sites, but with dozens of them enabled, something occasionally takes out a video player, a CAPTCHA or a site’s own scripts.
Updated November 2026. Menus move around between versions: if a label is a little different, look for the closest match.
Quick test
- Click the uBlock Origin toolbar icon.
- Press the large power button. That turns uBlock Origin off for this site only.
- Reload. If the page works, uBlock Origin was the cause. Press the power button again to turn it back on, then find the specific block below.
Find exactly what it blocked
- In the uBlock Origin popup, open the logger (the list icon).
- Reload the broken page with the logger open.
- Blocked requests are highlighted. Each row shows the domain, the filter that matched, and the list it came from.
- Look for the domain behind the broken feature: a video host,
recaptchaorhcaptcha, a payment provider, a comments service, or one of the site’s own subdomains.
Allow just that, not the whole site
- From the logger: select the blocked row to open its details, where you can create an exception for that domain.
- By hand: open the uBlock Origin dashboard, go to My filters and add an exception line such as
@@||cdn.example.com^, then Apply changes. - A list that keeps breaking things: if the logger shows the same list every time (often an “annoyances” or cookie-notice list), consider disabling just that list under Filter lists.
- Sites where you turned it off: they’re listed under Trusted sites in the dashboard, so you can undo them later.
Good to know
- A warning page instead of the site (“uBlock Origin has prevented the following page from loading”) means the whole domain is on a malware or badware list. Only use Proceed if you’re sure the site is safe.
- Hidden, not blocked: cosmetic filters hide page elements without blocking any request. If something is missing but nothing is blocked, look for hiding rules in the logger.
- uBlock Origin Lite (the Manifest V3 version for Chrome) works differently: its popup has a filtering-mode slider per site. Move it to No filtering to test, and to Basic for a gentler setting.