What's new in the WebKitGTK 2.31.1 release?
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  - Remove support for NPAPI plugins.
  - Enable the web process cache when PSON is enabled too.
  - TLS errors and proxy settings APIs have been moved from WebKitContext to WebKitWebsiteDataManager.
  - Add new API to remove individual scripts/stylesheets using WebKitUserContentManager.
  - Correctly apply the system font scaling factor.
  - Show main loop frames information in the web inspector.