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. A flaw was found in Mozilla. The Mozilla Foundation Security Advisory describes the issue of Firefox behaving slightly differently for already known resources when loading CSS resources involving CSS variables. This flaw could probe the browser history.
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