| Package | Affected versions | Patched versions |
|---|---|---|
| firefox | < 83.0 | 83.0 |
| firefox esr | < 78.5 | 78.5 |
| thunderbird | < 78.5 | 78.5 |
It was possible to cause the browser to enter fullscreen mode without displaying the security UI; thus making it possible to attempt a phishing attack or otherwise confuse the user. This vulnerability affects Firefox < 83, Firefox ESR < 78.5, and Thunderbird < 78.5.
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