Ubuntu Security Notice 3761-1 - Multiple security issues were discovered in Firefox. If a user were tricked in to opening a specially crafted website, an attacker could potentially exploit these to cause a denial of service, or execute arbitrary code. It was discovered that if a user saved passwords before Firefox 58 and then later set a master password, an unencrypted copy of these passwords would still be accessible. A local user could exploit this to obtain sensitive information. Various other issues were also addressed.
5250f9b22135e87b334a076a8fd606b93af51fe81a2760f9e0440c740663d869