Crumb — Privacy Policy

Effective date: 2026-05-05

Crumb is a content-blocking extension for Firefox. It does not collect, store,
transmit, or share any data about you, your browsing, or your device.

What Crumb does

When you visit a web page, Crumb inserts a stylesheet that hides cookie-consent banners, and the browser's built-in declarativeNetRequest engine blocks a fixed list of consent-management scripts at the network layer. Both the stylesheet contents and the network rules are bundled with the extension and
do not change at runtime.

What Crumb does not do

• No telemetry, analytics, crash reporting, or usage metrics.
• No remote configuration or rule fetching after install.
• No reading or transmission of page content, form data, cookies, or browsing
  history.
• No background script and no persistent storage.
• No advertising or third-party SDKs.

Permissions

Crumb requests two permissions, both used solely for the local blocking
described above:

• declarativeNetRequest — to install the static block list.
• <all_urls> host access — to inject the stylesheet on every page.

Neither permission is used for data collection.

Source code

Crumb is open source under the MIT license. The full source — including every filter list and the build pipeline that produces the extension — lives at <https://github.com/rcurranmoz/crumb>.

Contact

Issues or questions: <https://github.com/rcurranmoz/crumb/issues>.