Multiple flaws were found in the processing of malformed web content. A web page containing malicious content could cause Firefox to crash or, potentially, execute arbitrary code with the privileges of the user running Firefox (CVE-2017-5373, CVE-2017-5375, CVE-2017-5376, CVE-2017-5378, CVE-2017-5380, CVE-2017-5383, CVE-2017-5386, CVE-2017-5390, CVE-2017-5396).