The z-order of the browser windows could be manipulated to hide the fullscreen notification. This could potentially be leveraged to perform a spoofing attack. This vulnerability affects Firefox < 135 and Thunderbird < 135.
{
"binaries": [
{
"binary_version": "135.0+build2-0ubuntu0.20.04.1",
"binary_name": "firefox"
},
{
"binary_version": "135.0+build2-0ubuntu0.20.04.1",
"binary_name": "firefox-dev"
},
{
"binary_version": "135.0+build2-0ubuntu0.20.04.1",
"binary_name": "firefox-geckodriver"
},
{
"binary_version": "135.0+build2-0ubuntu0.20.04.1",
"binary_name": "firefox-mozsymbols"
}
],
"availability": "No subscription required"
}