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Test your applicationsThe Ubuntu
security team deemed this advisory irrelevant for Ubuntu:20.04
.
Note: Versions mentioned in the description apply only to the upstream firefox
package and not the firefox
package as distributed by Ubuntu
.
A flaw in handling fullscreen transitions may have inadvertently caused the application to become stuck in fullscreen mode when a modal dialog was opened during the transition. This issue left users unable to exit fullscreen mode using standard actions like pressing "Esc" or accessing right-click menus, resulting in a disrupted browsing experience until the browser is restarted.
This bug only affects the application when running on macOS. Other operating systems are unaffected. This vulnerability affects Firefox < 133, Firefox ESR < 128.5, Thunderbird < 133, and Thunderbird < 128.5.