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I keep getting "A script is making this page run slow" in Firefox

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This message is displayed by Firefox whenever some javascript is taking a long time to run. It can happen with a TiddlyWiki file if you have a lot of tiddlers or are using some plugins that do some extra work that takes a long time. You can get rid of the messages by making Firefox's maximum script run time a little longer. Here's how it's done:

  • Type about:config in the address bar and press enter.
  • Scroll down until you see dom.max_script_run_time
  • Double click it and type in 20 seconds (the default is 5 seconds)
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