What's new in the WebKitGTK+ 2.15.3 release?
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  - Add API to set network proxy settings.
  - Add API to set initial notification permissions.
  - Add WebKitSecurityOrigin to the API.
  - Add tag property to WebKitNotification.
  - Create GLX OpenGL contexts using version 3.2 (core profile) when available to reduce the memory
    consumption on Mesa based drivers.
  - Improve memory pressure handler to reduce the CPU usage on memory pressure situations.
  - Add support for key and code properties on keyboard events.
  - More user agent string improvements to improve compatibility with several websites.
  - Fix network process crashes when loading custom URI schemes.
  - Fix web process crash when closing the web view in X11.
  - Fix several crashes and rendering issues.
  - Translation updates: German.