It exists that selecting text caused Firefox to crash in some
circumstances. An attacker could potentially exploit this to cause a
denial of service. (CVE-2022-28287)
Mozilla Foundation Security Advisory 2022-13
Security Vulnerabilities fixed in Firefox 99
Announced
April 5, 2022
Impact
high
Products
Firefox
Fixed in
Firefox 99
...
The sourceMapURL feature in devtools was missing security checks that would have allowed a webpage to attempt to include local files or other files that should have been inaccessible ...