Jkratzer

**Name of the Vulnerable Software and Affected Versions** Firefox versions prior to 96 Thunderbird versions prior to 91.6 Firefox ESR versions prior to 91.6 **Description** The issue is related to a problem that occurs when a worker is shut down, allowing a script to run late in its lifecycle, at a point where it should not be possible. This could potentially lead to security restrictions being bypassed. The estimated number of potentially affected devices worldwide is not specified. **Recommendations** For Firefox versions prior to 96, update to version 96 or later. For Thunderbird versions prior to 91.6, update to version 91.6 or later. For Firefox ESR versions prior to 91.6, update to version 91.6 or later.