Francois Lajeunesse Robert

**Name of the Vulnerable Software and Affected Versions** Firefox ESR versions prior to 60 Firefox versions prior to 60 **Description** The issue is related to errors in privilege assignment in the WebExtensions system for developing browser extensions. It allows a remote attacker to bypass existing security restrictions. WebExtensions can use request redirection and a "filterResponseData" filter to bypass host permission settings, redirect network traffic, and access content from a host without explicit user permission. **Recommendations** For Firefox ESR versions prior to 60, update to version 60 or later to resolve the issue. For Firefox versions prior to 60, update to version 60 or later to resolve the issue. As a temporary workaround, consider restricting the use of WebExtensions that utilize request redirection and the `filterResponseData` filter until a patch is available.