Security update for MozillaFirefox (important)

This update to Mozilla Firefox 52.3esr fixes a number of security issues. The following vulnerabilities were advised upstream under MFSA 2017-19 boo1052829: - CVE-2017-7798: XUL injection in the style editor in devtools - CVE-2017-7800: Use-after-free in WebSockets during disconnection -...