Firefox behaved slightly differently for already known resources when loading CSS resources involving CSS variables. This could have been used to probe the browser history. This vulnerability affects Thunderbird < 91.9, Firefox ESR < 91.9, and Firefox < 100.
CPE | Name | Operator | Version |
---|---|---|---|
firefox | lt | 100.0 | |
firefox_esr | lt | 91.9 | |
thunderbird | lt | 91.9 |