The vulnerabilities could potentially be exploited to conduct cross-site scripting attacks, to let malicious attackers launch a remote execution of code on users' computers, and to expose sensitive information, according to an advisory from security company Secunia.
While Mozilla labeled the updates "critical," Secunia rated them "highly critical."
"Some of these (flaws) were crashes that showed evidence of memory corruption, and we presume that at least some of these could be exploited to run arbitrary code with enough effort," according to one of six-related "critical" Mozilla security advisories issued Tuesday.
Last month,. Like the new flaws, the earlier ones involved the potential for malicious attackers to take hold of users' systems.