| Package | Affected versions | Patched versions |
|---|---|---|
| firefox | < 83.0 | 83.0 |
| firefox esr | < 78.5 | 78.5 |
| thunderbird | < 78.5 | 78.5 |
During browser shutdown, reference decrementing could have occured on a previously freed object, resulting in a use-after-free, memory corruption, and a potentially exploitable crash. This vulnerability affects Firefox < 83, Firefox ESR < 78.5, and Thunderbird < 78.5.
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