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Blocks specific sites from appearing in Google search results

Chrome Web Store / Firefox Add-ons / App Store (for macOS and iOS, thanks to Group-Leafy)


This extension prevents the sites you specify from appearing in Google search results.

You can add rules on search result pages, or on sites to be blocked by clicking the toolbar icon. Rules can be specified either by match patterns (e.g. *://**) or by regular expressions (e.g. /example\.(net|org)/).

You can synchronize rulesets across devices via cloud storage. At the moment, Google Drive and Dropbox are supported.

You can also subscribe to public rulesets. Some subscriptions are listed on the website:

Supported search engines

This extension is available in the below search engines.

Web Images Videos News
Google ✔️ ✔️ ✔️ ✔️
Google (iOS) ✔️ ✔️ ✔️ ✔️
Bing ✔️ ✔️ ✔️ ✔️
Bing (iOS) ✔️ ✔️ ✔️ ✔️
DuckDuckGo ✔️ ✔️ ✔️ ✔️
DuckDuckGo (iOS) ✔️ ✔️ ✔️ ✔️
Ecosia ✔️
Ecosia (iOS) ✔️
Qwant ✔️ ✔️ *1 ✔️
Qwant (iOS) ✔️ ✔️ *1 ✔️
Startpage ✔️ ✔️ ✔️
Startpage (iOS) ✔️ ✔️ ✔️

*1 Works only if you turn off "Always play videos on"

For subscription providers

To publish a ruleset as a subscription, place a ruleset file encoded in UTF-8 on a suitable HTTP(S) server, and publish the URL. Here is an example hosted on GitHub:

In uBlacklist >=6.6.0 for Chrome, subscription links are available. To add a subscription with name and url, the following URL can be used as a shortcut to the options page:{urlEncode(name)}&url={urlEncode(url)}

For the above example:

For developers


To build this extension, Node.js and Yarn are required.

git clone

cd uBlacklist


# yarn build <browser:=chrome> <mode:=development> <typecheck:=notypecheck>
yarn build firefox production

Before opening a pull request, you should make sure that yarn lint, yarn test, and yarn build-all pass.

yarn lint
# Some lint errors can be fixed automatically
# yarn fix

yarn test

yarn build-all

NOTE: The API keys and secrets for the sync feature are not included in this repository. To develop the sync feature, set your own API keys and secrets in the .env file.



To add a locale,

  1. Determine an ISO language code such as en referring to kLanguageInfoTable.
  2. Copy src/locales/en.json.ts to src/locales/${languageCode}.json.ts and translate entries.
  3. Open src/scripts/dayjs-locales.ts and import the dayjs locale.
  4. To localize description and screenshots on web stores, create web-store-assets/${languageCode}/ and add files.
    • Screenshot localization is available only on Chrome Web Store.
    • Screenshots should be 1280x800.


iorate (Twitter)


uBlacklist is licensed under MIT License.