Related Vulnerabilities: CVE-2021-23958  

A security issue was found in Firefox before version 85.0. The browser could have been confused into transferring a screen sharing state into another tab, which would leak unintended information.

Severity Medium

Remote Yes

Type Information disclosure

Description

A security issue was found in Firefox before version 85.0. The browser could have been confused into transferring a screen sharing state into another tab, which would leak unintended information.

AVG-1492 firefox 84.0.2-1 85.0-1 High Fixed

https://www.mozilla.org/en-US/security/advisories/mfsa2021-03/#CVE-2021-23958
https://bugzilla.mozilla.org/show_bug.cgi?id=1642747