| Package | Affected versions | Patched versions |
|---|---|---|
| firefox | < 96.0 | 96.0 |
| firefox esr | < 91.5 | 91.5 |
| thunderbird | < 91.5 | 91.5 |
A race condition could have allowed bypassing the fullscreen notification which could have lead to a fullscreen window spoof being unnoticed.<br>*This bug only affects Firefox for Windows. Other operating systems are unaffected.*. This vulnerability affects Firefox ESR < 91.5, Firefox < 96, and Thunderbird < 91.5.
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