The about:crashcontent and about:crashparent pages can be triggered by web content. These pages are used to crash the loaded page or the browser for test purposes. This issue allows for a DoS attack by a malicious site which links to these pages. This vulnerability affects Firefox < 64. External References: https://www.mozilla.org/en-US/security/advisories/mfsa2018-29/#CVE-2018-18510
Statement: This vulnerability did not affect the Firefox 60 ESR stream.