Security update for Mozilla Firefox (important)

This update for Mozilla Firefox to 52.8.0 ESR fixes the following issues:

Security issssue fixed: (bsc#1092548, MFSA 2018-12):

• CVE-2018-5183: Backport critical security fixes in Skia
• CVE-2018-5154: Use-after-free with SVG animations and clip paths
• CVE-2018-5155: Use-after-free with SVG animations and text paths
• CVE-2018-5157: Same-origin bypass of PDF Viewer to view protected PDF
  files
• CVE-2018-5158: Malicious PDF can inject JavaScript into PDF Viewer
• CVE-2018-5159: Integer overflow and out-of-bounds write in Skia
• CVE-2018-5168: Lightweight themes can be installed without user
  interaction
• CVE-2018-5178: Buffer overflow during UTF-8 to Unicode string conversion
  through legacy extension
• CVE-2018-5150: Memory safety bugs fixed in Firefox 60 and Firefox ESR
  52.8

The following non-security changes are included:

• Various stability and regression fixes
• Performance improvements to the Safe Browsing service to avoid slowdowns
  while updating site classification data