What's new in the WebKitGTK+ 2.18.4 release?
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  - Make WebDriver implementation more spec compliant.
  - Fix a bug when trying to remove cookies before a web process is spawned.
  - WebKitWebDriver process no longer links to libjavascriptcoregtk.
  - Fix several memory leaks in GStreamer media backend.
  - Security fixes: CVE-2017-13866, CVE-2017-13870, CVE-2017-7156, CVE-2017-13856.