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
(boo#1052829):

• CVE-2017-7798: XUL injection in the style editor in devtools
• CVE-2017-7800: Use-after-free in WebSockets during disconnection
• CVE-2017-7801: Use-after-free with marquee during window resizing
• CVE-2017-7784: Use-after-free with image observers
• CVE-2017-7802: Use-after-free resizing image elements
• CVE-2017-7785: Buffer overflow manipulating ARIA attributes in DOM
• CVE-2017-7786: Buffer overflow while painting non-displayable SVG
• CVE-2017-7753: Out-of-bounds read with cached style data and
  pseudo-elements#
• CVE-2017-7787: Same-origin policy bypass with iframes through page
  reloads
• CVE-2017-7807: Domain hijacking through AppCache fallback
• CVE-2017-7792: Buffer overflow viewing certificates with an extremely
  long OID
• CVE-2017-7804: Memory protection bypass through WindowsDllDetourPatcher
• CVE-2017-7791: Spoofing following page navigation with data: protocol
  and modal alerts
• CVE-2017-7782: WindowsDllDetourPatcher allocates memory without DEP
  protections
• CVE-2017-7803: CSP containing ‘sandbox’ improperly applied
• CVE-2017-7779: Memory safety bugs fixed in Firefox 55 and Firefox ESR
  52.3