When using the Performance API, an attacker was able to notice subtle differences between PerformanceEntries and thus learn whether the target URL had been subject to a redirect. This vulnerability affects Firefox < 103.
[
{
"vendor": "Mozilla",
"product": "Firefox",
"versions": [
{
"version": "unspecified",
"lessThan": "103",
"status": "affected",
"versionType": "custom"
}
]
}
]