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  "js.dump_stack_on_debuggee_would_run.enabled": false,
  "js.werror.enabled": false,
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  "js.mem.max": -1,
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  "js.mem.gc.refresh_frame_slices.enabled": true,
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  "js.mem.gc.high_frequency_heap_growth_max": 300,
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  "js.mem.gc.high_frequency_high_limit_mb": 500,
  "js.mem.gc.allocation_threshold_mb": 30,
  "js.mem.gc.decommit_threshold_mb": 32,
  "js.mem.gc.empty_chunk_count_min": 1,
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  "layout.column-width.enabled": false,
  "layout.column-count.enabled": false,
  "layout.column-gap.enabled": false,
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  "layout.flex-direction.enabled": false,
  "layout.text-orientation.enabled": false,
  "layout.viewport.enabled": false,
  "layout.writing-mode.enabled": false,
  "network.http.redirection-limit": 20,
  "network.mime.sniff": false,
  "shell.homepage": "http://servo.org",
  "shell.native-titlebar.enabled": true,
  "shell.builtin-key-shortcuts.enabled": true
}