What's new in the WebKitGTK 2.48.6 release?
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  - Fix emojis incorrectly rendered in their text variant.
  - Add support for font collection / fragment identifiers.
  - Fix web process deadlock on exit.
  - Fix stuttering when playing WebP animations.
  - Fix CSS animations with cubic-bezier timing function.
  - Do not start the MemoryPressureMonitor if it's disabled.
  - Fix several crashes and rendering issues.